Question 492648
perimeter of present garden = 20 ft. Area = 25 sq.ft
2(l+w)=20
l+w=10

l*w = 25
l=25/w

substitute l in first equation
25/w+ w= 10

LCD = w
multiply by w

25*w /w +w^2=10w

w^2-10w+25w=0

(w-5)^2=0
w= +/-5
so w=5 
so it is a square.

increase size three times
length & width = 15 ft
perimeter = 60 ft
area = 15*15 = 225 sq.ft