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

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