3) 420 meters of fencing is needed to enclose a rectangular field. If one side is 90 meters more than the other, find the dimensions (length and width) of the field.

Length = 150

Width = 60

How to solve:

Set up the equation as

x+x+x+90+x+90=420

Add up the x's and the 90's to get

4x+180=420

Subtract 420-180=240

4x=240

Divide 4 from 240 to get

x=60

(That gives you the width)

To get the length you just have to do 60+90=150