Question

area 240cm² length 40cm breadth???

Answer 1

area=length×breadth
240=40×b
240/40=b
b=6cm

Answer 2

Breadth = 6cm

How ?

Breadth = Area / Length
Breadth = 240cm(square) / 40cm
Breadth = 6cm

Answer check

Area = Length × Breadth
Area = 40cm × 6cm
Area = 240cm (square)