Question
A bag contains yellow and brown balls in the ratio of 2 : 7. There is a total of 135 balls in the bag. How many more yellow balls must be added into the bag so that the number of yellow balls will be the same as the number of brown balls?
2 m

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A bag contains yellow and brown balls in the ratio of 2 : 7. There is a total of 135 balls in the bag. How many more yellow balls must be added into the bag so that the number of yellow balls will be the same as the number of brown balls?