Question
A bag contains green and purple balls in the ratio of 2 : 5. There is a total of 105 balls in the bag. How many more green balls must be added into the bag so that the number of green balls will be the same as the number of purple balls?
2 m

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A bag contains green and purple balls in the ratio of 2 : 5. There is a total of 105 balls in the bag. How many more green balls must be added into the bag so that the number of green balls will be the same as the number of purple balls?