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

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