The ratio of 2 numbers is 1:2 and their H.C.F. is 10. Their L.C.M. is ?
Choose the correct choice from the following answers:	A) 10	B) 20	C) 30	D) 50	E) 40
Let the numbers be x and 2x   Their H.C.F. = 10   so the numbers are 1*10 , 2*10 = 10,20   L.C.M. = 20   Answer is 20
<result>B</result>
The ratio of 2 numbers is 1:2 and their H.C.F. is 10. Their L.C.M. is ?