Question
A bag contains white and purple marbles in the ratio of 3 : 7. There is a total of 60 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 purple marbles?
2 m

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A bag contains white and purple marbles in the ratio of 3 : 7. There is a total of 60 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 purple marbles?