Description: A, B, C 3 fisherman fishing, they brought on board 21 baskets. That night back, they found seven baskets full of fish, with seven baskets in a half-loaded fish baskets, and seven basket is empty, because they did not weigh, that only through a visual seven baskets full of fish is equivalent to the weight of seven semi-fish basket weight of the same. The fish will not reversing the premise, how to fish and divided into three baskets?
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