Grade 11 Math
posted by Bob .
jackie mows a stip of uniform width around her 25m by 15m rectangular lawn and leaves a patch of lawn that is 60% of the original area. What is the width of the strip?

2(15+2w)w+ 25*2w=.60(15*25)
check that 
Thanks that seems to have worked the back of my text book says it is 2.1 but i got 2.5 close enough.

2x+2=0