Question 1068456
For a rectangle,
{{{P=2L+2W}}}
For this rectangle,
{{{L=W+7.5}}}
and
{{{2L+2W=35}}}
Substituting,
{{{2(W+7.5)+2W=35}}}
{{{2W+15+2W=35}}}
{{{4W=20}}}
{{{W=5}}}{{{m}}}
So,
{{{L=5+7.5}}}
{{{L=12.5}}}{{{m}}}