The ratio of red balls to green balls is 4:3. Three green

The ratio of red balls to green balls is 4:3. Three green balls need to be added in order for there to be the same number of green balls and red balls. How many red balls are there?

A. 3
B. 4
C. 8
D. 12
E. 24

OA D

Source: Manhattan Prep

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by Ian Stewart » Sun Jun 09, 2019 7:11 am

Adding 3 balls corresponds to changing one value in the ratio by 1, so our 'multiplier' must be 3, and we must have 12 and 9 balls of each colour, so the answer is 12.

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