Graduate Record Examinations (GRE) Quizzes Mathematics GRE Problem Solving Quiz

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?

Option A):
25 : 2
Option B):
5 : 1
Option C):
15 : 2
Option D):
10 : 5
Option E):
20 : 2

Correct Answer is Option A):
25 : 2