Question 1153710
This method may seem slightly backward, but:
x, the original width
3x, the original length


{{{(3x-2)(x+5)=90}}}
Solve any way you wish.  Question asks for each of the two factors.

skipping steps,...
{{{highlight_green(x=4)}}}



{{{3*4-2=highlight(10)}}}-----length of the new rectangle
-
{{{4+5=highlight(9)}}}------width of new rectangle