Three numbers are in the ratio 3:4:5 and their L.C.M. is 1200. Their H.C.F is? Pick
A) 20  B) 30  C) 40  D) 50  E) 60
Let the numbers be 3x,4x and 5x   their L.C.M. = 60x   60x = 1200   x = 20   The numbers are 3*20 , 4*20 , 5*20   Hence required H.C.F. = 20   20nswer is 20
<result>A</result>
Three numbers are in the ratio 3:4:5 and their L.C.M. is 1200. Their H.C.F is?