Answer:
<h3> 20 feet </h3>
Step-by-step explanation:
x - the hight of another sail

The original perimeter is 32ft.
The dimensions of the new rectangle are 72 ft wide and 24 ft long.
The new perimeter is 192 ft.
When the dimensions are multiplied by 6, the perimeter also multiplied by 6.
If your looking for the sum, it would be -5 :)