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    Question

    type-ssc

    The ratio of the height of a room and its semi-perimeter

    is 2:5. The cost of applying 50cm wide paper at the rate of Rs 8/meter on the remaining walls except 15 square meters of doors and windows is Rs 1040. What is the height of this room? 
    A 14meter Correct Answer Incorrect Answer
    B 4meter Correct Answer Incorrect Answer
    C 6meter Correct Answer Incorrect Answer
    D 8meter Correct Answer Incorrect Answer

    Solution

    Let the height of room =2x meter and (l + b) =5x meter Length of paper =1040/8 =130meter width of paper =50cm =50/100=1/2meter Area of paper = 130×1/2 =65m2 Area of four walls= (65+15) =80m2 2(l+ b) ×h =80 2(5x) ×2x=80 20x2 =80 X=2 Height of room =2x=2×2=4meter.

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