Question

The length of a rectangle is three times its width. The perimeter of the rectangle is 100 inches. What are the dimensions of the rectangle?

Answer 1

Answer:

We have l = 2w and 2l + 2w = 100 inches;

Then 4w + 2w = 100 inches;

6w = 100 inches;

w = 16.6;

l = 3 x 16.6;

l = 49.8 inches;

Step-by-step explanation:

Answer 2

Answer:

The dimensions are 12.5 inches width and 37.5 inches length.

Step-by-step explanation:

Givens:

• Length is three times the width, this can be represented as: $l=3w$
• The perimeter is 100 inches. The perimeter is expressed as: $P=2(l+w)$

So, to find the dimensions of the rectangle, that is, the length and width, we have to replace the first equation into the second one:

$100=2(3w+w)\\\frac{100}{2}=4w\\w=\frac{100}{8}= 12.5 \ in$

The length can be found using the first expression:

$l=3(12.5)=37.5$

Therefore, the dimensions are 12.5 inches width and 37.5 inches length.