In a game of 60 points, A can give B 15 points and C 20 points. How many points can B give C in a game of 90 points?
Correct answer A. 10 points
Explanation
When A scores 60, B scores 45 and C 40, so B : C = 9 : 8. When B scores 90, C scores 80, so B gives C 10 points.
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