Question 946219
For a rectangle,
{{{P=2(L+W)=24}}}
{{{L+W=12}}}
.
.
{{{L=1&2/5*W}}}
{{{L=(7/5)W}}}
Substituting,
{{{(7/5)W+W=12}}}
{{{(12/5)W=12}}}
{{{W=5}}}{{{ft}}}
Then,
{{{L+5=12}}}
{{{L=7}}}{{{ft}}}