7th grade math question. Help please - GoFuckYourself.com

baddog · 02-16-2012, 11:08 PM

7th grade math bites!
3 picnickers came upon a pile of watermelons. The first picnicker took half of all the watermelons plus a half of a watermelon. The second picnicker took half of what was left plus a half of a watermelon. The third picnicker took half of what was left plus a half a watermelon. There were 15 watermelons left. How many watermelons were in the original pile?

122.5?

RyuLion · 02-16-2012, 11:15 PM

Borked FTWW!!

FlexxAeon · 02-16-2012, 11:24 PM

63

and "fuck you", in advance

Shoehorn! · 02-16-2012, 11:25 PM

Seven.

RyuLion · 02-16-2012, 11:26 PM

Quote:

Originally Posted by FlexxAeon

63

and "fuck you", in advance

EddyTheDog · 02-16-2012, 11:26 PM

125......

asdasd · 02-16-2012, 11:27 PM

I'm not reading that brainwashed shit.

Shotsie · 02-16-2012, 11:31 PM

Quote:

Originally Posted by FlexxAeon

63

and "fuck you", in advance

How did you come up with that number?

EddyTheDog · 02-16-2012, 11:32 PM

125/2 - .5 = 62

62/2 - .5 = 30.5

30/2 - .5 = 15

I think

bean-aid · 02-16-2012, 11:33 PM

shit... need to start again

FlexxAeon · 02-16-2012, 11:38 PM

Quote:

Originally Posted by Shotsie

How did you come up with that number?

math, bitch

FlexxAeon · 02-16-2012, 11:41 PM

Quote:

Originally Posted by FlexxAeon

math, bitch

15 = ((x/2 - 0.5) / 2) - 0.5

bean-aid · 02-16-2012, 11:42 PM

ahhh... too late for me

d-null · 02-16-2012, 11:45 PM

127 watermelons

Matyko · 02-16-2012, 11:47 PM

127 is the correct answer, it took me like 10 minutes in the morning before coffee... :P

EddyTheDog · 02-16-2012, 11:49 PM

Quote:

Originally Posted by d-null

127 watermelons

Yep - It is 127 not 125....

_Richard_ · 02-16-2012, 11:59 PM

123 err 127 gaa

8char

baddog · 02-17-2012, 12:02 AM

Quote:

Originally Posted by Matyko

127 is the correct answer, it took me like 10 minutes in the morning before coffee... :P

127 seems to be the new answer they are coming up with as well, can you show your math?

I proved it is right, I just don't know how you got there.

FlexxAeon · 02-17-2012, 12:03 AM

Quote:

Originally Posted by FlexxAeon

15 = ((x/2 - 0.5) / 2) - 0.5

bleh i rushed

15 = ((((x/2 - 0.5) / 2) - 0.5 ) / 2) - 0.5

127

martinsc · 02-17-2012, 12:03 AM

how big are the melons?

Matyko · 02-17-2012, 12:13 AM

Quote:

Originally Posted by baddog

127 seems to be the new answer they are coming up with as well, can you show your math?

I admit I tried to make it the usual way of math but I failed with that. Then I just did the plain pen and paper solution starting from backwards: to have 15 left I need 31 watermelons, so when the half of it is gone, minus a half 15 will remain. 31 is double the 15 plus one. tested this for the next level and it worked: double 31 plus one: 63 is next level. counted back: worked. 63x2 + 1 = 127 for the last level, counted back, worked, tadaaam!

I know it might sound stupid.. :P

baddog · 02-17-2012, 12:18 AM

Quote:

Originally Posted by Matyko

I admit I tried to make it the usual way of math but I failed with that. Then I just did the plain pen and paper solution starting from backwards: to have 15 left I need 31 watermelons, so when the half of it is gone, minus a half 15 will remain. 31 is double the 15 plus one. tested this for the next level and it worked: double 31 plus one: 63 is next level. counted back: worked. 63x2 + 1 = 127 for the last level, counted back, worked, tadaaam!

I know it might sound stupid.. :P

Actually, that is how I was trying to do it to, but I was pretty sure the teacher was not going to accept that explanation.

raymor · 02-17-2012, 12:22 AM

Quote:

Originally Posted by Matyko

I admit I tried to make it the usual way of math but I failed with that. Then I just did the plain pen and paper solution starting from backwards: to have 15 left I need 31 watermelons, so when the half of it is gone, minus a half 15 will remain. 31 is double the 15 plus one. tested this for the next level and it worked: double 31 plus one: 63 is next level. counted back: worked. 63x2 + 1 = 127 for the last level, counted back, worked, tadaaam!

I know it might sound stupid.. :P

That's how I would do it. Though I COULD do it forwards in my head, I think, I'm always up for cheating by doing it backwards.

bean-aid · 02-17-2012, 12:22 AM

From the beginning

Z = total watermelons

student 1 = a
student 2 = b
student 3 = c

a has .5Z + .5
b has .5a + .5
c has .5b + .5
c has 15
b = 29
a = 57
z = 113

113 total...

damn... that's wrong again... lol

Matyko · 02-17-2012, 12:23 AM

Quote:

Originally Posted by baddog

Actually, that is how I was trying to do it to, but I was pretty sure the teacher was not going to accept that explanation.

https://youtube.com/watch?v=YR5ApYxkU-U#t=2m47s

EddyTheDog · 02-17-2012, 12:26 AM

Quote:

Originally Posted by raymor

That's how I would do it. Though I COULD do it forwards in my head, I think, I'm always up for cheating by doing it backwards.

Is doing it backwards cheating?

Shotsie · 02-17-2012, 12:26 AM

Quote:

Originally Posted by beaner

From the beginning

Z = total watermelons

student 1 = a
student 2 = b
student 3 = c

a has .5Z + .5
b has .5a + .5
c has .5b + .5
c has 15
b = 29
a = 57
z = 113

113 total...

EddyTheDog · 02-17-2012, 12:27 AM

Quote:

Originally Posted by Shotsie

baddog · 02-17-2012, 12:28 AM

Quote:

Originally Posted by beaner

From the beginning

Z = total watermelons

student 1 = a
student 2 = b
student 3 = c

a has .5Z + .5
b has .5a + .5
c has .5b + .5
c has 15
b = 29
a = 57
z = 113

113 total...

You are forgetting that there are 15 left over, not the 3rd kid got 15. With 113 b = 28.5

bean-aid · 02-17-2012, 12:32 AM

a = z*.5 -.5 (what is left)
b = a*.5 -.5 (what is left)
c = b*.5 -.5 (what is left)
c = 15
b=31
a=63
z=127

d-null · 02-17-2012, 12:32 AM

x= total watermelons
a= first person
b= second person
c= third person

x-a-b-c=15
a=0.5x+0.5
b=(x-a)*0.5+0.5
c=(x-a-b)*0.5+0.5

127 watermelons

bean-aid · 02-17-2012, 12:33 AM

Quote:

Originally Posted by Shotsie

yup... lol.

I got it at the end...

epitome · 02-17-2012, 12:39 AM

I just ate a quarter of a watermelon.

Time to start over.

_Richard_ · 02-17-2012, 12:44 AM

Quote:

Originally Posted by Shotsie

bean-aid · 02-17-2012, 12:54 AM

Quote:

Originally Posted by _Richard_

Don't be mean... this is what I enjoy on a thirsty thursday

A good math question to put sparks in the brain

KRosh · 02-17-2012, 01:12 AM

x=x/2 - 1/2

Transform to Algebra..B represents before the watermelons were taken and A represents after they are taken

B/2 - 1/2 = A.

solve for B
2*A + 1 = B.

Now work backwards...

Value of x:15

2*15+1=31

2*32+1=63

2*63+1=127

Answer = 127

baddog · 02-17-2012, 01:19 AM

Quote:

Originally Posted by KRosh

x=x/2 - 1/2

Transform to Algebra..B represents before the watermelons were taken and A represents after they are taken

B/2 - 1/2 = A.

solve for B
2*A + 1 = B.

Now work backwards...

Value of x:15

2*15+1=31

2*32+1=63

2*63+1=127

Answer = 127

I will just call you the next time.

Double trouble · 02-17-2012, 01:28 AM

41 ?

Deej · 02-17-2012, 01:36 AM

its that damned half a melon each time that most dont consider not being a portion of the half...

Adraco · 02-17-2012, 02:00 AM

Quote:

Originally Posted by Matyko

I admit I tried to make it the usual way of math but I failed with that. Then I just did the plain pen and paper solution starting from backwards: to have 15 left I need 31 watermelons, so when the half of it is gone, minus a half 15 will remain. 31 is double the 15 plus one. tested this for the next level and it worked: double 31 plus one: 63 is next level. counted back: worked. 63x2 + 1 = 127 for the last level, counted back, worked, tadaaam!

I know it might sound stupid.. :P

This is how I did too, 127 is correct.

OY · 02-17-2012, 03:36 AM

Thanks Baddog - this just reminded me on what year my math grade began to deteriorate. Pretty much exactly in 7th grade.....

RazorSharpe · 02-17-2012, 04:59 AM

erm - it can't possibly be 127, can it? 3 people took 1/2 a watermelon so there has to be a half left over but what is left over is 15 FULL watermelons!!

EddyTheDog · 02-17-2012, 05:06 AM

Quote:

Originally Posted by RazorSharpe

erm - it can't possibly be 127, can it? 3 people took 1/2 a watermelon so there has to be a half left over but what is left over is 15 FULL watermelons!!

It works out.

127/2 = 63.5

63.5 - 0.5 = 63

63/2 = 31.5

31.5 - 0.5 = 31

31/2 - 15.5

15.5 - 0.5 = 15

DWB · 02-17-2012, 05:13 AM

I have always been bad with math questions like that. So looks like I'm going back to the 7th grade.

But the questions to ask is, have any of you applied such a question in real life?

RazorSharpe · 02-17-2012, 05:14 AM

nevermind - silly me! figured it out now!!

Matyko · 02-17-2012, 07:08 AM

Quote:

Originally Posted by DWB

I have always been bad with math questions like that. So looks like I'm going back to the 7th grade.

But the questions to ask is, have any of you applied such a question in real life?

I think it doesn't really matter and obviously there's no use of such knowledge in real life, but this actually can make a kid Think and use his or her logic, which is not bad.

L-Pink · 02-17-2012, 07:15 AM

You really need to start dating older women that don't have homework.

.

DEA · 02-17-2012, 07:28 AM

fuck math...lets eat watermelon

raymor · 02-17-2012, 07:37 AM

Quote:

Originally Posted by Matyko

I think it doesn't really matter and obviously there's no use of such knowledge in real life, but this actually can make a kid Think and use his or her logic, which is not bad.

I use it all day long. There were 127 members. One username was used from three IPs. One third of all IPs are mobiles ... Whose the thief?

Jack jacked off on your site three times over the weekend. He downloaded 700 MB. Carl logged in twice but and downloaded half again as much ...
Are any of them downloading too much more than normal, indicating they are downloading to post it somewhere rather than jacking off?

Vladimir has 2000 proxies. Each proxy can brute force 12 times per minute ...

_Richard_ · 02-17-2012, 08:31 AM

Quote:

Originally Posted by beaner

Don't be mean... this is what I enjoy on a thirsty thursday

A good math question to put sparks in the brain

hey i fucked up too, forgot to take away the last half a watermelon

that's a funny picture.. come on..

02-16-2012, 11:08 PM	#1
baddog So Fucking Banned Industry Role: Join Date: Apr 2001 Location: the beach, SoCal Posts: 107,089	7th grade math question. Help please 7th grade math bites! 3 picnickers came upon a pile of watermelons. The first picnicker took half of all the watermelons plus a half of a watermelon. The second picnicker took half of what was left plus a half of a watermelon. The third picnicker took half of what was left plus a half a watermelon. There were 15 watermelons left. How many watermelons were in the original pile? 122.5?

02-16-2012, 11:15 PM	#2
RyuLion ClubDomCash.com Industry Role: Join Date: Mar 2003 Location: San Diego Posts: 32,277	Borked FTWW!! __________________ Adult Biz Consultant A tech head since 1995

02-16-2012, 11:24 PM	#3
FlexxAeon Confirmed User Industry Role: Join Date: May 2003 Posts: 3,765	63 and "fuck you", in advance __________________ flexx [dot] aeon [at] gmail

02-16-2012, 11:25 PM	#4
Shoehorn! Die With Your Boots On Join Date: Oct 2003 Location: Hawaii Posts: 22,872	Seven. __________________

02-16-2012, 11:33 PM	#10
bean-aid So Fucking Banned Industry Role: Join Date: Jun 2011 Location: the land of woke sleuths Posts: 16,493	shit... need to start again Last edited by bean-aid; 02-16-2012 at 11:36 PM..

02-16-2012, 11:26 PM	#6
EddyTheDog Just Doing My Own Thing Industry Role: Join Date: Jan 2011 Location: London, Spain, New Zealand, GFY - Not Croydon... Posts: 25,248	125......

02-16-2012, 11:27 PM	#7
asdasd So Fucking Banned Industry Role: Join Date: Feb 2005 Posts: 1,225	I'm not reading that brainwashed shit.

02-16-2012, 11:32 PM	#9
EddyTheDog Just Doing My Own Thing Industry Role: Join Date: Jan 2011 Location: London, Spain, New Zealand, GFY - Not Croydon... Posts: 25,248	125/2 - .5 = 62 62/2 - .5 = 30.5 30/2 - .5 = 15 I think

02-16-2012, 11:42 PM	#13
bean-aid So Fucking Banned Industry Role: Join Date: Jun 2011 Location: the land of woke sleuths Posts: 16,493	ahhh... too late for me Last edited by bean-aid; 02-16-2012 at 11:51 PM..

02-16-2012, 11:45 PM	#14
d-null . . . Industry Role: Join Date: Apr 2007 Location: NY Posts: 13,724	127 watermelons

02-16-2012, 11:47 PM	#15
Matyko PsyHead Industry Role: Join Date: Aug 2005 Location: Hungary Posts: 8,672	127 is the correct answer, it took me like 10 minutes in the morning before coffee... :P __________________ -=- Register with our ref link and we help you with the setup! -=- AdSpyglass.com - Double your profit from brokers

02-16-2012, 11:59 PM	#17
_Richard_ Too lazy to set a custom title Industry Role: Join Date: Oct 2006 Location: Earth Posts: 30,989	123 err 127 gaa 8char Last edited by _Richard_; 02-17-2012 at 12:00 AM..

02-17-2012, 12:03 AM	#20
martinsc Too lazy to set a custom title Industry Role: Join Date: Jun 2005 Location: 127.0.0.1 Posts: 27,047	how big are the melons? __________________ Make Money

02-17-2012, 12:22 AM	#24
bean-aid So Fucking Banned Industry Role: Join Date: Jun 2011 Location: the land of woke sleuths Posts: 16,493	From the beginning Z = total watermelons student 1 = a student 2 = b student 3 = c a has .5Z + .5 b has .5a + .5 c has .5b + .5 c has 15 b = 29 a = 57 z = 113 113 total... damn... that's wrong again... lol Last edited by bean-aid; 02-17-2012 at 12:28 AM..

02-17-2012, 12:32 AM	#30
bean-aid So Fucking Banned Industry Role: Join Date: Jun 2011 Location: the land of woke sleuths Posts: 16,493	a = z.5 -.5 (what is left) b = a.5 -.5 (what is left) c = b*.5 -.5 (what is left) c = 15 b=31 a=63 z=127

02-17-2012, 12:39 AM	#33
epitome So Fucking Lame Industry Role: Join Date: Jun 2009 Location: St. Petersburg, FL Posts: 12,156	I just ate a quarter of a watermelon. Time to start over.

02-17-2012, 01:12 AM	#36
KRosh So Fucking Outlawed Industry Role: Join Date: Nov 2001 Posts: 5,114	x=x/2 - 1/2 Transform to Algebra..B represents before the watermelons were taken and A represents after they are taken B/2 - 1/2 = A. solve for B 2A + 1 = B. Now work backwards... Value of x:15 215+1=31 232+1=63 263+1=127 Answer = 127 __________________ ICQ 115433750

02-17-2012, 01:28 AM	#38
Double trouble So Fucking What? Industry Role: Join Date: Feb 2008 Posts: 22,251	41 ? __________________

02-17-2012, 01:36 AM	#39
Deej I make pixels work Industry Role: Join Date: Jun 2005 Location: I live here... Posts: 24,386	its that damned half a melon each time that most dont consider not being a portion of the half... __________________ Deej's Designs n' What Not Hit me up for Design, CSS & Photo Retouching Icq#30096880

02-17-2012, 03:36 AM	#41
OY Industry Pioneer Industry Role: Join Date: Oct 2002 Location: USA/EU/ASIA Posts: 5,401	Thanks Baddog - this just reminded me on what year my math grade began to deteriorate. Pretty much exactly in 7th grade..... __________________ Around since 1997, and the company that introduced "Cascading Billing" in MPA3® Affiliate Management and Tracking Software Outsourcing With A Norwegian Twist - NordBits - Inquire within!

02-17-2012, 04:59 AM	#42
RazorSharpe Confirmed User Industry Role: Join Date: Aug 2001 Location: Scotland Posts: 2,238	erm - it can't possibly be 127, can it? 3 people took 1/2 a watermelon so there has to be a half left over but what is left over is 15 FULL watermelons!! __________________ Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.

02-17-2012, 05:13 AM	#44
DWB Registered User Industry Role: Join Date: Jul 2003 Location: Encrypted. Access denied. Posts: 31,779	I have always been bad with math questions like that. So looks like I'm going back to the 7th grade. But the questions to ask is, have any of you applied such a question in real life?

02-17-2012, 05:14 AM	#45
RazorSharpe Confirmed User Industry Role: Join Date: Aug 2001 Location: Scotland Posts: 2,238	nevermind - silly me! figured it out now!! __________________ Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.

02-17-2012, 07:15 AM	#47
L-Pink working on my tan Industry Role: Join Date: Mar 2005 Location: Florida/Kentucky Posts: 39,151	You really need to start dating older women that don't have homework. .

02-17-2012, 07:28 AM	#48
DEA So Fucking Banned Join Date: Oct 2004 Location: Online Posts: 627	fuck math...lets eat watermelon