a) 2 : 3 : 5
b) 5 : 4 : 6
c) 8 : 12 : 15
d) 6 : 4 : 5
Answer: c
Explanation:
$$\eqalign{
& \frac{{\text{A}}}{{\text{B}}} = \frac{2}{3} \cr
& \frac{{\text{B}}}{{\text{C}}} = \frac{4}{5} \cr} $$
A : B : C = 2 × 4 : 3 × 4 : 3 × 5 = 8 : 12 : 15
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