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9th Class Mathematics Surface Areas and Volumes Question Bank Surface Areas and Volumes

  • question_answer
    Find the cost of constructing a wall 8 m long, 4 m high and 20 cm thick at the rate of Rs. 25 per \[{{m}^{3}}.\]

    A) Rs. 16                         

    B)   Rs. 80             

    C)   Rs. 160                       

    D)   Rs. 320                       

    Correct Answer: C

    Solution :

    The dimensions of wall \[=8\,m\times 4\] \[m\times 20\,cm=8m\times 4m\times 0.2m\] Volume of the wall \[=(8\times 4\times 0.2){{m}^{3}}\] \[=6.4{{m}^{2}}\] \[\therefore \]Cost of constructing a wall at a rate of ` 25 per \[{{m}^{2}}=6.4\times \] Rs. 25 = Rs.160


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