Question 1066554
Original rectangle
Width w
Length L
{{{L=3w-10}}}
Area, {{{wL=w(3w-10)}}}


New rectangle
Width {{{w+20}}}
Length {{{L-15=3w-10-15=3w-25}}}
Area, {{{(w+20)(3w-25)}}}


{{{newRectangleArea-originalRectangleArea=175}}}
{{{highlight_green((w+20)(3w-25)-w(3w-10)=175)}}}
Simplify this and solve for w...