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

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