Question

The perimeter of a rectangle is 400 meters. The length is 15 meters less than 4 times the width. Find the length and width. (show work)

Answer 1

l=4*w-15
P=2w+2l=2w+2*(4w-15)=2w+8w-2*15=400
10w-30=400
10w=400+30=430
w=430:10
w=43 m
l=4*43-15=172-15
l=157 m