SOLUTION: Tom wants to enclose a section of his lawn that is 30 yards long and 20 yards wide. He buys 125 yards of fencing. How much fencing is left over?

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This is a perimeter of a rectangle problem. Perimeter (P) of a rectangle is the sum of all sides
P = 2 x length + 2 x width.
In this problem the Perimeter (P) = The amount needed for the area Tom wants to enclose
Question: How many yards are leftover?
Leftover = Amount bought – amount needed

Given information:
Rectangle = 30 yards long by 20 yards wide
Amount Bought = 125 yards
Step 1: Find the Perimeter(P)of rectangle 30 yards long and 20 yards wide.
P = 2 x length + 2 x width.
P = (2 x 30) + (2 x 20)
P = 60 + 40
P = 100
Step 2: Find the yards leftover.
Leftover = Bought – Needed
Leftover = 125 - Perimeter
Leftover = 125 - 100
Leftover = 25
Answer: 25 yards is leftover