Question

The length of a rectangle is three times its width. The perimeter is 40. What is the area?

Answer 1

Let x be the width.
If the length is three times its width
And a rectangle has 2 lengths and 2 widths.

2 (3x) + (1x) 2= 40
6x + 2x = 40
8x = 40
/8
x = 5

If x = 5
The length is 15
The width is 5

Formula for area = base x height
15 x 5 = 75

Answer = 75