If a:b:c = 3:4:7, then the ratio (a+b+c):c is equal to
Choose the correct choice from the following answers:
A) 2 : 1  B) 14 : 3  C) 7 : 2  D) 1 : 2  E) none

Rationale: solution : ( a + b + c ) = 3 + 4 + 7 = 14 and c = 7 then , ( a + b + c ) : c = 2 : 1 . answer : option a
Answer: A