If the ratio of a to b is 11 to 3 and the ratio of b to c is 1 to 5, what is the ratio of a to c?  Choose the correct choice from the following.
A) 4 / 15  B) 11 / 15  C) 2 / 5  D) 4 / 5  E) 7 / 6

Rationale: "a : b = 11 : 3 - - 1 b : c = 1 : 5 = > b : c = 3 : 15 - - 2 from 1 and 2 , we get a : c = 11 : 15 answer b"
Answer: B