The answer and explanation is given in the picture below
I hope it helps.
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.
-0.4742 and -0.488888888
Correct me if I am wrong.
4. Option 3, a has length of infinity and mn does not split a, a splits mn
5. Option 2, only 1 possibility, since it has to split mn into equal parts