Question

Ratio of efficiency of A and B is 5:3 and that of B and C is 5:8 who is most efficient

Answer 1

A is most efficient will be the answer

Answer 2

Ratio of A :  B = 5 : 3

Ratio of B : C = 5 : 8

Since B appeared in both ratio, we make them the same.

Ratio of A :  B = 5 : 3

Multiply by 5:

Ratio of A :  B = 25 : 15

Ratio of B : C = 5 : 8

Multiply by 3:

Ratio of B : C = 15 : 24

Combine the ratio:

Ratio of A : B : C = 25 : 15 : 24

Answer: A is the most efficient