Question
A bag contains black and yellow balls in the ratio of 2 : 7. There is a total of 108 balls in the bag. How many more black balls must be added into the bag so that the number of black balls will be the same as the number of yellow balls?
2 m

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A bag contains black and yellow balls in the ratio of 2 : 7. There is a total of 108 balls in the bag. How many more black balls must be added into the bag so that the number of black balls will be the same as the number of yellow balls?