The perimeter of a doormat is 90 inches. The doormat 15 inches wide. How long is it

See PsyDAG's post below. Same process.

To find the length of the doormat, we need to know the perimeter and the width of the doormat.

The perimeter of a rectangle can be calculated by adding the lengths of all its sides. In this case, we have two equal lengths and two equal widths.

Let's assume the length of the doormat is "L" inches.

So, the perimeter of the doormat is given by the formula:

Perimeter = 2 * (Length + Width)

Given that the perimeter is 90 inches and the width is 15 inches, we can substitute these values into the formula:

90 = 2 * (L + 15)

Now let's solve for L:

90 = 2L + 30
2L = 90 - 30
2L = 60
L = 60/2
L = 30

Therefore, the length of the doormat is 30 inches.