Who are you: Student (Elementary)
If a rectangular lot's perimeter is 340 feet, the width is 70 feet. How do I determine the length of the lot?
I drew a diagram.
If you walk all the way around the lot you have walked 340 feet. 70 feet of that was up the left side and 70 feet was down the right side. How much of the distance was walking along the top and bottom? How much of the distance was walking along the top?