The ratio of numbers is 4:5 and their H.C.F is 4. Their L.C.M is:  Choose the correct choice from the following
A) 80  B) 16  C) 24  D) 48  E) 98

Rationale: "let the numbers be 4 x and 5 x . then their h . c . f = x . so , x = 4 . so , the numbers are 16 and 20 . l . c . m of 16 and 20 = 80 . answer : a"
Answer: A