Three numbers are in the ratio 3:4:5 and their L.C.M. is 1800. 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 = 1800   x = 30   The numbers are 3*30 , 4*30 , 5*30   Hence required H.C.F. = 30   Answer is 30
<result>B</result>
Three numbers are in the ratio 3:4:5 and their L.C.M. is 1800. Their H.C.F is?