Question 408112
If the width of the rectangle is x inches, then lengthis {{{(x+40)}}} inches
The perimeter of rectangle is {{{P=2*(W+L)}}}, when W - width, L - length
so perimeter is {{{2*(x+x+40)=2*(2x+40)}}}
Equation
{{{2*(2x+40)=240}}} devide by 2
{{{2x+40=120}}}
{{{2x=120-40}}}
{{{2x=80}}}
{{{x=80/2}}}
{{{x=40}}}
so the width is 40 inches, then the length is 40+40=80 inches