Question
A bag contains brown and yellow marbles in the ratio of 3 : 7. There is a total of 80 marbles in the bag. How many more brown marbles must be added into the bag so that the number of brown marbles will be the same as the number of yellow marbles?
2 m

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A bag contains brown and yellow marbles in the ratio of 3 : 7. There is a total of 80 marbles in the bag. How many more brown marbles must be added into the bag so that the number of brown marbles will be the same as the number of yellow marbles?