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Discussion :: Mensuration

  1. The dimensions of a room are 25 feet * 15 feet * 12 feet. What is the cost of white washing the four walls of the room at Rs. 5 per square feet if there is one door of dimensions 6 feet * 3 feet and three windows of dimensions 4 feet * 3 feet each?
    2. A.
    Rs. 4800
    B.
    Rs. 3600
    C.
    Rs. 3560
    D.
    Rs. 4530
    E.
    None of these

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    Workspace

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    Answer : Option D

    Explanation :

    Area of the four walls = 2h(l + b)

    Since there are doors and windows, area of the walls = 2 * 12 (15 + 25) - (6 * 3) - 3(4 * 3) = 906 sq.ft.

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