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1. If A : B = 2 : 3 and B : C = 4 : 5 then A : B : C is

A. 2 : 3 : 5

B. 5 : 4 : 6

C. 8 : 12 : 15

D. 6 : 4 : 5

Solution:

\begin{aligned} \frac{A}{B} = \frac{2}{3} \\ \frac{B}{C} = \frac{4}{5} \end{aligned}

A : B : C = 2 × 4 : 3 × 4 : 3 × 5 = 8 : 12 : 15

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