Question 889921
You could solve this purely symbolically and do the computations afterward.


Length L, width w.
m=2,
A for area, A=12.5.


L=mw and wL=A.
{{{w(mw)=A}}}
{{{mw^2=A}}}
{{{w^2=A/m}}}
{{{w=sqrt(A/m)}}}
You could rationalize the denominator if you wish to.
{{{w=sqrt(A/m)(sqrt(m)/sqrt(m))}}}
{{{highlight(w=sqrt(mA)/m)}}}
-
{{{L=m*sqrt(mA)/m}}}
{{{highlight(L=sqrt(mA))}}}


Substitute the given values for m and A to compute w and L.