Question
A bag contains red and gold marbles in the ratio of 3 : 7. There is a total of 120 marbles in the bag. How many more red marbles must be added into the bag so that the number of red marbles will be the same as the number of gold marbles?
2 m

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A bag contains red and gold marbles in the ratio of 3 : 7. There is a total of 120 marbles in the bag. How many more red marbles must be added into the bag so that the number of red marbles will be the same as the number of gold marbles?