<PRE><B>Question 193073</B>
R1 + R2 = 16
R1*R2/(R1+R2) = 3 (A shortcut for the recip of the sum of the recips)
R1*R2/16 = 3
R1*R2 = 48
R1 = 48/R2
Sub for R1 into the 1st eqn
48/R2 + R2 = 16
48 + R2^2 = 16R2
R2^2 - 16R2 + 48 = 0
(R2 - 12)*(R2 - 4) = 0
R2 = 12 or 4
R1 =  4 or 12</PRE>