Question 617637
Let the width = {{{ w }}}
The length is {{{ w + 15 }}}
The formula for perimeter is:
{{{ P = 2w + 2*( w + 15 ) }}}
{{{ P = 90 }}}
{{{ 90 = 2w + 2w + 30 }}}
{{{ 4w = 90 - 30 }}}
{{{ 4w = 60 }}}
{{{ w = 15 }}}
{{{ w + 15 = 30 }}}
The dimensions are 15' x 30'
check:
{{{ P = 2w + 2*( w + 15 ) }}}
{{{ P = 2*15 + 2*( 15 + 15 ) }}}
{{{ P = 30 + 60 }}}
{{{ P = 90 }}}
OK