Multiple Choice Questions on The perimeter of the floor of a room is 18 m What is the area of the walls of the room if the height........... for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

The perimeter of the floor of a room is 18 m What is the area of the walls of the room if the height...........

Quantitative Aptitude (RRB NTPC) Mensuration 2D
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    The perimeter of the floor of a room is 18 m. What is the area of the walls of the room, if the height of the room is 3 m?

    This questions was previously asked in
    RRBNTPC (2021)
    View All RRBNTPC Previous Year Papers

    54 m2 

    Correct Answer

    21 m2

    Incorrect Answer

    108 m2

    Incorrect Answer

    42 m2 

    Incorrect Answer
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    Explanation:

    Explanation:-
     Given perimeter of the floor of a room is 18 m
     2(l + b) = 18
     l + b = 9
     Given height of room = 3m
     Area of the four walls of cuboid = 2(l + b) h
     = 2 × 9 × 3 = 54 m2

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