Question
A bag contains white and yellow marbles in the ratio of 2 : 7. There is a total of 81 marbles in the bag. How many more white marbles must be added into the bag so that the number of white marbles will be the same as the number of yellow marbles?
2 m

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A bag contains white and yellow marbles in the ratio of 2 : 7. There is a total of 81 marbles in the bag. How many more white marbles must be added into the bag so that the number of white marbles will be the same as the number of yellow marbles?