<PRE><B>Question 1071818</B>
The sum of 2 numbers is 20, their product is 10. If the sum of their reciprocals is a, find a? 
----
x + y = 20
x*y = 10
-------
x(20-x) = 10
x^2 - 20x + 10 = 0
----
x = 19.487
y = 0.513
====
a = 1/x + 1/y = 2
-----------------
Cheers,
Stan H.
-----------------</PRE>