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

Answer: Option C

Solution(By Examveda Team)

$$\eqalign{ & \text{B} = \frac{40 + 30 + 50}{3} = \frac{120}{3} = 40 \cr & \text{C} = \frac{20 + 40 + 20}{3} = \frac{80}{3} \cr & \text{then B : C} = 40 : \frac{80}{3} \cr & \,\,\,\,\,\,\,\,\, \text{B : C} = 3 : 2 \cr} $$