Three number are in the ratio of 3 : 4 : 5 and their L.C.M. is 1200. What is their H.C.F.?
Select:
A) 20  B) 60  C) 90  D) 100  E) 120
Let the numbers be 3x, 4x and 5x.   Then, their L.C.M. = 60x   60x = 1200   x = 20   The numbers are (3 x 20), (4 x 20) and (5 x 20).   The H.C.F. is 20.   The answer is 20.
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Three number are in the ratio of 3 : 4 : 5 and their L.C.M. is 1200. What is their H.C.F.?