Three numbers are in the ratio of 2 : 3 : 4 and their L.C.M. is 180. What is their H.C.F.?	Pick
A) 15 B) 20 C) 40 D) 60 E) 70
Let the numbers be 2x, 3x, and 4x.   LCM of 2x, 3x and 4x is 12x.   12x = 180   x = 15   HCF of 2x, 3x and 4x = x = 15   The answer is 15.
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Three numbers are in the ratio of 2 : 3 : 4 and their L.C.M. is 180. What is their H.C.F.?