Question
A bag contains red and brown balls in the ratio of 3 : 7. There is a total of 60 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 brown balls?
2 m

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A bag contains red and brown balls in the ratio of 3 : 7. There is a total of 60 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 brown balls?