Three numbers are in the ratio 3:4:5 and their L.C.M. is 2400. Their H.C.F is?  Pick one
A) 20	B) 30	C) 40	D) 50	E) 60
Let the numbers be 3x,4x and 5x   their L.C.M. = 60x   60x = 2400   x = 40   The numbers are 3*40 , 4*40 , 5*40   Hence required H.C.F. = 40   Answer is 40
<result>C</result>
Three numbers are in the ratio 3:4:5 and their L.C.M. is 2400. Their H.C.F is?