Question
A bag contains red and pink marbles in the ratio of 3 : 7. There is a total of 80 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 pink marbles?
2 m

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A bag contains red and pink marbles in the ratio of 3 : 7. There is a total of 80 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 pink marbles?