<PRE><B>Question 981231</B>
A diagram is often helpful.  Try making one to represent the description.


w, width of the park
L, length of the park
u, the uniform width of the driveway around the park
-
two given values:  w=60, L=80
unknown value:  u


Park area, {{{wL}}}
Total Area of park AND driveway, {{{(w+2u)(L+2u)}}}
Driveway area, {{{(w+2u)(L+2u)-wL=(3/25)wL}}}


Solve the driveway area equation for u.  It is quadratic in u.  You can solve it completely in symbols before substituting the given values for evaluating u; or you can substitute the given values at any stage you want.  There is some simplification you should do, BEFORE substituting the given w and L values.</PRE>