Question 33064
Let the width be x
Since 2 width on each side we represent this as:
30-2x and 40-2x
(30-2x)(40-2x)=1800
1200+2x^2+10x=1800
2x^2+10x-600=0
x^2+5x-300=0
Factor:
(x+20) and (x-15)
x=15
Hence, the uniform width around the garden is 15cm each.
Paul.