Question
A bag contains black and pink marbles in the ratio of 2 : 7. There is a total of 72 marbles in the bag. How many more black marbles must be added into the bag so that the number of black marbles will be the same as the number of pink marbles?
2 m

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A bag contains black and pink marbles in the ratio of 2 : 7. There is a total of 72 marbles in the bag. How many more black marbles must be added into the bag so that the number of black marbles will be the same as the number of pink marbles?