The perimeter of a pool table is 30ft. The table is twice as long as it is wide. What is the length of the pool table?

Let the width be represented as w and since the length is twice as that it can be represented as 2w. The perimeter for a rectangle is 2 (w+2w) or 6w since the perimeter is 30 the width is 5 and since the length is twice that it is 10 ft.