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

  • question_answer
    In the five digit number 1b6a3, a is the greatest single digit perfect cube and twice of it exceeds b by 7. Then the sum of the number and its cube root is __.

    A)  18700            

    B)  11862

    C)         19710

    D)         25320

    Correct Answer: C

    Solution :

    The given five digit number is\[1b6a3\]. We know that, the greatest single digit perfect cube is 8, \[\therefore a=8\] Also,\[b=2\times (8)-7=9\] So, the five digit number becomes 19683. Now, \[19683+\sqrt[3]{19683}=19683+27=19710\]


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