Question

Find the width of a rectangle with a perimeter of 90 and a length of 15. Draw and label the rectangle first to set up your problem

Answer 1

P=2w+2l

We know that P=90 and l=15 so we can plug in and solve for w:

90=2w+2(15)

90=2w+30

60=2w

30=w

The width is 30.

(you could draw a diagram by labelling the two shorter sides 15 and the other sides w)

Hope this helps!!

Answer 2

width = 30

Explanation:

We know that the formula for finding the perimeter if a rectangle is:

Perimeter of a rectangle = 2 (l + w)

We are given the value of the perimeter and the length so we can find the width of the rectangle by putting in the given values.

Perimeter of rectangle = 2l +2w

90 = 2(15) + 2w

90 = 30 + 2w

90 - 30 = 2w

w = 60 / 2

w = 30

Therefore, the width of the rectangle, with length 15 and perimeter 90, is 30.