The ratio of 2 numbers is 3:7 and their H.C.F. is 10. Their L.C.M. is ?  Choose the correct choice:	A) 220	B) 210	C) 252	D) 236	E) 260
Let the numbers be 3x and 7x   Their H.C.F. = 10   so the numbers are 3*10 , 7*10 = 30,70   L.C.M. = 210   Answer is 210
<result>B</result>
The ratio of 2 numbers is 3:7 and their H.C.F. is 10. Their L.C.M. is ?