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In a set of 216 marbles, there are x black marbles and y white marbles. If the number of white marbles is 7 times the number of black marbles, how many black marbles are there? |
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Answer» In a set of 216 marbles, there are x black marbles and y white marbles. If the number of white marbles is 7 times the number of black marbles, how many black marbles are there? |
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