The ratio of two numbers is 3 : 6 and their H.C.F. is 7. Their L.C.M. is	Choose the correct choice from the following.
A) 48 B) 42 C) 56 D) 27 E) 67
Explanation:   Let the numbers be 3x and 6x. Then, their H.C.F. = x. So, x = 7.   So, the numbers 21 and 42.   L.C.M. of 21 and 42 = 42.   Option 42
<result>B</result>
The ratio of two numbers is 3 : 6 and their H.C.F. is 7. Their L.C.M. is