6. The width of a rectangle is 15 feet less than its length, and the perimeter is 210 feet. Find the width:

Answer 1

Let "x" be the rectangle length, then the width will be "x - 15". The perimeter is twice the length plus twice the width so we can say:

2x + 2(x - 15) = 210

2x + 2x - 30 = 210

4x = 240

x = 60

So the rectangle width is 60 feet and the width is 15 feet less or 45 feet.