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8th Class Mental Ability Numbers Question Bank Number System

  • question_answer
    The smallest number by which 2560 must be multiplied so that the product will be a perfect cube.

    A) 35                       

    B)       25

    C) 8                         

    D)        5

    E) None of these

    Correct Answer: B

    Solution :

    Explanation Option [b] is correct. The factors of 2560 is given by  \[2560=5\times 8\times 8\times 8\] In this factors there are three 8 and one 5. So in order to make the number 2560 perfect cube we have to multiply it by 25. Therefore, 25 is the least number by which it must be multiplied so that it becomes a perfect cube.


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