Question
A bag contains grey and pink marbles in the ratio of 3 : 7. There is a total of 130 marbles in the bag. How many more grey marbles must be added into the bag so that the number of grey marbles will be the same as the number of pink marbles?
2 m

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A bag contains grey and pink marbles in the ratio of 3 : 7. There is a total of 130 marbles in the bag. How many more grey marbles must be added into the bag so that the number of grey marbles will be the same as the number of pink marbles?