Question 985850
*[illustration pool].

outer area - pool area = 54


(x+4)(x+9) - x(x+5)=54

x^2+13x+36-(x^2+5x)=54

x^2+13x+36-x^2-5x=54

8x+36=54

8x=54-36

8x=18

x=2.25

width = 2.5 m

length = 2.25+5 = 7.25m