Three numbers are in the ratio of 2 : 3 : 4 and their L.C.M. is 240. Their H.C.F. is: Pick one.
A) 30	B) 20	C) 40	D) 60	E) 70
Explanation:   Let the number be 2x, 3x and 4x   LCM of 2x, 3x and 4x = 12x   12x = 240   =&gt; x = 240/12= 
<gadget id="calculator">240/12</gadget>
<output>20</output>
20   HCF of 2x, 3x and 4x= x = 20   Answer: Option 20
<result>B</result>
Three numbers are in the ratio of 2 : 3 : 4 and their L.C.M. is 240. Their H.C.F. is: