The area of the four walls in a room is&

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Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Mensuration: 2D

Question:

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.

Options:

50m²

60m²

70m²

80m²

Correct Answer:

50m²

Explanation:

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