Question
A bag contains silver and yellow balls in the ratio of 2 : 7. There is a total of 90 balls in the bag. How many more silver balls must be added into the bag so that the number of silver balls will be the same as the number of yellow balls?
2 m

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A bag contains silver and yellow balls in the ratio of 2 : 7. There is a total of 90 balls in the bag. How many more silver balls must be added into the bag so that the number of silver balls will be the same as the number of yellow balls?