## College Algebra 7th Edition

We know that the perimeter is 2*length+2*width. We use the image for guidance and the given fact that the perimeter is 102: $102=2(20+2x)+2(15+2x)$ We solve for $x$: $102=40+4x+30+4x$ $102=70+8x$ $32=8x$ $x=4$ So the width of the strip is 4 inches.