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8th Class Mathematics Cubes and Cube Roots Question Bank Cubes and Cube Roots

  • question_answer
    Atul made a cuboid of plasticine. Length, breadth and height of the cuboid are 25 cm. 25 cm and 50 cm. How many minimum such cuboids he needs to make a perfect cube?

    A)  4                    

    B)  20      

    C)  12                  

    D)         25      

    Correct Answer: A

    Solution :

            Volume of cuboid \[=25\times 25\times 50\] \[=5\times 5\times 5\times 5\times 5\times 5\times 2\] Since there is only one 2 In the prime factorisation. So, he needs \[2\times 2=4\], to make it a perfect cube. \[\therefore \] He need 4 such cuboids to make a perfect cube.


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