Question
A bag contains red and black balls in the ratio of 3 : 7. There is a total of 140 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 black balls?
2 m

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A bag contains red and black balls in the ratio of 3 : 7. There is a total of 140 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 black balls?