a) 30 point
b) 20 points
c) 10 points
d) 12 points
Answer: c
Explanation:
$$\eqalign{
& A:B = 60:45 \cr
& A:C = 60:40 \cr
& \frac{B}{C} = {\frac{B}{A} \times \frac{A}{C}} = {\frac{{45}}{{60}} \times \frac{{60}}{{40}}} \cr
& = \frac{{45}}{{40}} = \frac{{90}}{{80}} = 90:80 \cr
& {\text{B}}\,{\text{can}}\,{\text{give}}\,{\text{C}}\,{\text{10}}\,{\text{points}}\,{\text{in}}\,{\text{a}}\,{\text{game}}\,{\text{of}}\,{\text{90}} \cr} $$
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