Question

The length of a rectangle is six times its width.

Answer 1

Rectangle area = a*b
perimeter = 2(a+b)

a - lenght
b - width

a = 6b

a*b=600
6b*b=600
$6b^2=600$
$b^2=100$
$b=\sqrt{100}$
b=10
a = 6*10 = 60
Perimeter = 2(a+b)=2(60+10)=2*70=140 yd