The feed conversion efficiency of the poorest weight gainer is?

The data for feed consumption and weight gain of our four farm animals labeled P, Q, R and S are shown below.

Use the data to answer this question correctly

P: 50kg feed consumed and 20kg weight gained.

Q: 90kg feed consumed and 30kg weight gained.

R: 100kg feed consumed and 25kg weight gained.

S: 150kg feed consumed and 30kg weight gained.

A. 0.40
B. 0.33
C. 0.25
D. 0.20

Correct Answer:

Option D = 0.20