If xy > 0, 1/x + 1/y = 6, and 1/xy = 5, then (x+y)/6 = ?  Pick one.
A) 1/25 B) 1/6 C) 1/5 D) 5 E) 6
(1/X+1/Y)=6 canbe solved as {(x+y)/xy}=5. Substituting for 1/xy=5, we get   x+y=6/5   ==&gt; (x+y)/6= 6/(5*6)=1/5.   1/5
<result>C</result>
If xy > 0, 1/x + 1/y = 6, and 1/xy = 5, then (x+y)/6 = ?