Question
A bag contains silver and yellow marbles in the ratio of 3 : 7. There is a total of 90 marbles in the bag. How many more silver marbles must be added into the bag so that the number of silver marbles will be the same as the number of yellow marbles?
2 m

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A bag contains silver and yellow marbles in the ratio of 3 : 7. There is a total of 90 marbles in the bag. How many more silver marbles must be added into the bag so that the number of silver marbles will be the same as the number of yellow marbles?