Question
A bag contains white and yellow balls in the ratio of 2 : 5. There is a total of 77 balls in the bag. How many more white balls must be added into the bag so that the number of white balls will be the same as the number of yellow balls?
2 m

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A bag contains white and yellow balls in the ratio of 2 : 5. There is a total of 77 balls in the bag. How many more white balls must be added into the bag so that the number of white balls will be the same as the number of yellow balls?