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    Subject

    Quantitative Aptitude

    Topic

    Areas & Volumes

    The dimensions of a room are 10m x 7m x 5m. There are 2 doors and 3 windows in the room. The dimensions of the doors are 1m x 3m. One window is of size 2m x 1.5m and the other 2 windows are of size 1m x 1.5m. The cost of painting the walls at Rs. 3 per sq m is

    ক)
    Rs.174
    খ)
    Rs.274
    গ)
    Rs.374
    ঘ)
    Rs.474

    Explanation

    Area of 4 walls = 2(l+b)h =2(10+7) x 5 = 170 sq m Area of 2 doors and 3 windows = 2(1x3)+(2x1.5)+2(1x1.5) = 12 sq m area to be planted = 170 -12 = 158 sq m Cost of painting = Rs. 158 x 3 = Rs. 474

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