Question 568196
Area of pool = 30* 90 = 2700 ft^2  ( rectangle)

Area of pool + walkway = 4000 ft^2

area of walkway = 1300 ft^2

let the width of walk way be x

(30+2x)(90+2x)=4000

2700+60x+180x+4x^2=4000

4x^2+240x+2700=4000

/4
x^2+60x+675=1000

x^2+60x-325=0


x^2+65x-5x-325=0
x(x+65)-5(x+650=0
(x+65)(x-5)=0

x= 5 m

The width has to be less than 5 m