Rectangles - 7th. Grade Math

The length of a rectangle is 3 times the width. The perimeter of the rectangle is 48 feet. What are the measurements for the length and width?

Answer:
Width = 6 ft.
Length = 18 ft.

Steps:
If the width of the rectangle = x
Then the length will be 3x
The formula for the perimeter of a rectangle = 2length + 2 width
Substituting the numbers we get:
48 = 2(3x) + 2x
48 = 6x + 2x
48 = 8x
x = 48/8 = 6
Therefore the width = 6 feet
The length = 3 (6 ft) = 18 feet

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