Question
A bag contains white and purple balls in the ratio of 2 : 7. There is a total of 72 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 purple balls?
2 m

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A bag contains white and purple balls in the ratio of 2 : 7. There is a total of 72 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 purple balls?