Which of the following is the lowest ratio ?

A. 7 : 15

B. 15 : 23

C. 17 : 25

D. 21 : 39

Answer: Option A

Solution(By Examveda Team)

$$\eqalign{ & \Rightarrow 7:15 = \frac{7}{{15}} = 0.466 \cr & \Rightarrow 15:23 = \frac{{15}}{{23}} = 0.652 \cr & \Rightarrow 17:25 = \frac{{17}}{{25}} = 0.68 \cr & \Rightarrow 21:39 = \frac{{21}}{{39}} = 0.538 \cr} $$
Clearly, 7 : 15 is the lowest