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Three piles of 7 beans each are to be made from 10 red, 5 yellow, and 6 green beans. If all of the beans must be used and each stack must contain at least one bean of each color, then what is the maximum number of red beans that can be put in one of the stacks? A.5 B.6 C.8 D.9 E.10
Since each pile must have a bean of each color, max red beans can be 5 in any pile. Rest of the options automatically eliminates themselves because if max red beans is to be 6, 2 more (yellow and green) makes it 8 in each pile...not possible.