I have a science degree and I couldn't figure it out at first either ... there is something about the wording of the instructions that is just confusing. As someone pointed out, it was probably something to do with the two separate rows and us wanting to automatically make that the two separate numbers.
And for the record I use math all the time since I've finished school, I use ratios frequently to figure things out. The person who posted that math is useless is really missing out on some useful tools in life.
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Suzanne

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