Two numbers have a H.C.F of 11 and a product of two numbers is 1991. Find the L.C.M of the two numbers?  Answers.
A) 140 B) 181 C) 160 D) 170 E) 180

Rationale: "l . c . m of two numbers is given by ( product of the two numbers ) / ( h . c . f of the two numbers ) = 1991 / 11 = 181 . answer : b"
Answer: B