Question 1024098
The legs, x and y.
{{{x+y=20}}}


{{{(1/2)xy=30}}}


Solve the system {{{system(xy=60,x+y=20)}}}.


Start this way:
{{{y=20-x}}}
-
{{{x(20-x)=60}}}
{{{20x-x^2=60}}}
continue....