Question

Jo's collection contains US, Indian and British stamps. If the ratio of US to Indian stamps is 5 to 2 and the ratio of Indian to British stamps is 5 to 1, what is the ratio of US to British stamps?
A. 5 : 1
B. 10 : 5
C. 15 : 2
D. 20 : 2
E. 25 : 2

Answer 1

Ratio of US to Indian stamps is 5:2
U/I = 5:2
= 25:10

Ratio of Indian to British stamps is 5:1
I/B = 5:1
= 10:2

Now , Ratio of US to British stamps 
U/B = 25:2

The answer is E.