Question 314925
The perimeter of a rectangle is,
{{{P=2*(L+W)=60}}}
{{{L+W=30}}}
.
.
.
{{{L=W+6}}}
Substitute,
{{{(W+6)+W=30}}}
{{{2W+6=30}}}
{{{2W=24}}}
{{{highlight(W=12)}}}
Then from above,
{{{L=W+6}}}
{{{highlight(L=18)}}}