The length of a rectangular field is twice its breadth. Given its perimeter is 54 m, find its length and breadth.
Given: Length of a rectangular field=2×breadth.
⇒l=2b
Perimeter=2(l+b)=54m
⇒2(2b+b)=54m
⇒3b=542=27m
⇒b=273=9m.
and we have l=2b=2×9=18m
∴l=18m and b=9m