Question
A bag contains yellow and purple marbles in the ratio of 3 : 7. There is a total of 100 marbles in the bag. How many more yellow marbles must be added into the bag so that the number of yellow marbles will be the same as the number of purple marbles?
2 m

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A bag contains yellow and purple marbles in the ratio of 3 : 7. There is a total of 100 marbles in the bag. How many more yellow marbles must be added into the bag so that the number of yellow marbles will be the same as the number of purple marbles?