Question 51265
A rectangular garden is to be surrounded by a walkway of constant width. The garden's dimensions are 30 ft by 40 ft. The total area, garden plus walkway, is to be 1800 ft^2. What must be the width of the walkway to the nearest thousandth?
WIDTH OF WALK WAY = X 
LENGTH OF GARDEN WITH WALK WAY =40+X+X=40+2X
WIDTH..........................=30+X+X=30+2X
AREA =(2X+40)(2X+30)=1800
(X+20)(X+15)=450
X^2+35X+300-450=0
X^2+35X-150=0
X={-35+SQRT(35^2+4*150)}/2=3.860