Question
A bag contains purple and red balls in the ratio of 2 : 11. There is a total of 91 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 red balls?
2 m

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A bag contains purple and red balls in the ratio of 2 : 11. There is a total of 91 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 red balls?