Discussion
In a game of 100 points, A can give B 20 points and A can give C 28 points. How many points can B give C in a game of 100 ?
Answer: B
Correct answer: 10
Giving 20 points means that when A scores 100, B scores 80; likewise C scores 72.
\[B : C = 80 : 72\]
Scaling so that B scores 100, C scores \(100 \times \tfrac{72}{80} = 90\). So B can give C 10 points.
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