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8th Class Mathematics Mensuration Question Bank Mensuration

  • question_answer
    A room is 9 m long, 6 m wide and 4 m high. Find the cost of plastering its walls and ceiling at the rate of Rs.2.50 per square metre.

    A)  Rs.435                       

    B)  Rs.600           

    C)  Rs.502           

    D)         Rs.354           

    Correct Answer: A

    Solution :

    Surface area of walls and ceiling \[=2h(l+b)+lb=2\times 4(9+6)+9\times 6\] \[=120+54=174{{m}^{2}}\] Cost of plastering walls and ceiling \[\text{=Rs}\text{. (174}\times \text{2}\text{.5)=Rs}\text{. 435}\]


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