If a*b*c=65, b*c*d = 65, c*d*e=1000 and d*e*f=250 the (a*f)/(c*d) = ?	Choose the correct choice from the following answers:
A) 1/2
B) 1/4
C) 3/4
D) 2/3
E) None of these
Explanation :   aâˆ—bâˆ—c/bâˆ—câˆ—d= 65/65 =&gt; a/d = 1   dâˆ—eâˆ—f/câˆ—dâˆ—e= 250/1000 =&gt; f/c = 1/4   a/d* f/c = 1 * 1/4 = 1/4   Answer : 1/4
<result>B</result>
If a*b*c=65, b*c*d = 65, c*d*e=1000 and d*e*f=250 the (a*f)/(c*d) = ?