The breadth of a rectangle whose area is 600 square metres and perimeter is 100 metres, is
20
Perimeter = 100 m
2(length + breadth) = 100
length + breadth = 50
Let breadth = x
then length = 50−x
Given that area = 600 sq m
x(50−x)=600
50x−x2=600
x2−50x=−600
x2−50x+625=−600+625
(x−25)2=25
(x−25)=5
x = 20 m