Question
A bag contains brown and silver balls in the ratio of 3 : 7. There is a total of 70 balls in the bag. How many more brown balls must be added into the bag so that the number of brown balls will be the same as the number of silver balls?
2 m

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A bag contains brown and silver balls in the ratio of 3 : 7. There is a total of 70 balls in the bag. How many more brown balls must be added into the bag so that the number of brown balls will be the same as the number of silver balls?