the perimeter of a rectangle is 400 meter. The length is three times the width. Which of the following best describes the length of the rectangle?

Length of the rectangle is 150 m.

Step-by-step explanation:

Step 1:

Let the width of the rectangle be x. Then the length = 3x. Given that perimeter = 400 m, find the length.

Perimeter of the rectangle = 2 (length + breadth)

400 = 2 (3x + x)

400 = 8x

∴ x = 400/8 = 50

⇒ Width is 50 m

∴ Length = 3x = 150 m