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Lay out the sacks, in any order you want, as long as you can remember which is first, second, and so forth. From the first sack take one bar, and place it on the scale. From the second 2 bars. Continue this until you have 10 stacks, one of one bar, one of two bars, ... one of ten bars, each from the appropriate sack. Weigh the coins. If they were all gold, the total would be 550 lbs. If the first stack weighed 11 grams instead of ten grams, 551; second stack 552, etc., thus pinpointing the underweight sack.
DUH!
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