Question
A bag contains purple and yellow balls in the ratio of 2 : 11. There is a total of 78 balls in the bag. How many more purple balls must be added into the bag so that the number of purple balls will be the same as the number of yellow balls?
2 m

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A bag contains purple and yellow balls in the ratio of 2 : 11. There is a total of 78 balls in the bag. How many more purple balls must be added into the bag so that the number of purple balls will be the same as the number of yellow balls?