To solve this question, write an equation where the width is x. x+x+(x+20)+(x+20) = 160. This equals 4x+40=160. Subtract 40 from both sides to get 4x=120. Divide both sides by 4 to get x=30. This means the width of the pool is 30 meters. Add 20 to the width (30) to get 50 meters. This means the length of the pool is 50 meters. I hope this helped!