The length of a rectangular pool is 5 times its width, and the width is 20 m less than the length. Find the area of the pool.

Let the width of the pool be x m, then its length is 5x.

It is known that the difference between the length and width of the pool is 20 m.

Based on this, we compose and solve the equation:

5x – x = 20;

4x = 20;

x = 20: 4;

x = 5 (m) – pool width.

5 × 5 = 25 (m) – length.

Formula for the area of a rectangle:

S = a × b, where a is the width, b is the length of the rectangle.

Find the pool area:

25 × 5 = 125 (m ^ 2).

Answer: The pool area is 125 m ^ 2.