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1. Study the following graph carefully and answer the given questions.

What is the ratio between average production by company B in three years to the average production by company C in three years?

A. 1 : 2

B. 4 : 3

C. 3 : 2

D. 2 : 3

Solution:

\begin{aligned} B = \frac{40 + 30 + 50}{3} = \frac{120}{3} = 40 \\ C = \frac{20 + 40 + 20}{3} = \frac{80}{3} \\ then B : C = 40 : \frac{80}{3} \\ B : C = 3 : 2 \end{aligned}

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