Question
A bag contains purple and grey marbles in the ratio of 3 : 7. There is a total of 140 marbles in the bag. How many more purple marbles must be added into the bag so that the number of purple marbles will be the same as the number of grey marbles?
2 m

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A bag contains purple and grey marbles in the ratio of 3 : 7. There is a total of 140 marbles in the bag. How many more purple marbles must be added into the bag so that the number of purple marbles will be the same as the number of grey marbles?