a) 3 : 13
b) 9 : 13
c) 36 : 13
d) 13 : 9
Answer: b
Explanation:
$$\eqalign{
& {\frac{A}{B}} \times {\frac{B}{C}} = {\frac{3}{4}} \times {\frac{{12}}{{13}}} \cr
& \,\frac{A}{C} = \frac{{36}}{{52}} = 9:13 \cr} $$
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