If the L.C.M of two numbers is 560 and their product is 42000, find the H.C.F of the numbers.
Pick one.
A) 50  B) 30  C) 75  D) 25  E) none of these

Rationale: "h . c . f = ( product of the numbers ) / ( their l . c . m ) = 42000 / 560 = 75 . answer : c"
Answer: C