The area of the four walls in a room is 120 m2. The length is twice the breadth. If the height of the room is 4 m, find the area of the floor.
Answer & explanation
Correct answer: option 1
l=2b
h=4m
Area fof four walls A=2(l+b)h
120=2×4(2b+b)
b=5m
Area of floor=lb
=2b.b=2b2
=2×52=50m2