Jo's collection contains US, Indian and British stamps. If the ratio of US to Indian stamps is 5 to 3 and the ratio of Indian to British stamps is 5 to 1, what is the ratio of US to British stamps?  Pick:  A) 5 : 1  B) 10 : 5  C) 15 : 2  D) 20 : 2  E) 25 : 2
U/I = 5/3   I/B = 5/1   Since I is multiple of both 2 (as per first ratio) and 5 (as per second ratio) so let's assume that I = 10   i.e. Multiplying teh first ratio by 5 and second ration by 2 in each numerator and denominator   then, U : I : B = 25 : 15 : 2   i.e. U : B = 25 : 2   Answer: Option 25 : 2
<result>E</result>
Jo's collection contains US, Indian and British stamps. If the ratio of US to Indian stamps is 5 to 3 and the ratio of Indian to British stamps is 5 to 1, what is the ratio of US to British stamps?