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A bag contains 8 red balls and 12 blue balls, 4 more red balls are added to the bag. How many more blue balls should be added to the bag so that the ratio of red and blue balls remains constant.

A bag contains 8 red balls and 12 blue balls, 4 more red balls are added to the bag. How many more blue balls should be added to the bag so that the ratio of red and blue balls remains constant. Correct Answer 6

Initial ratio of Red and Blue balls = 8 : 12 = 2 : 3

According to the question,

⇒ (8 + 4)/(12 + x) = 2/3

⇒ 24 + 2x = 36 

⇒ x = 6

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