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  4. Quantitative Aptitude
  5. Basic Calculations

Railways Quantitative Aptitude Basic Calculations Sample Paper Square Roots & Cube Roots Sample Test Paper-5

  • question_answer
    The least square number exactly divisible by 4, 6, 10, 15 is

    A)  400                 

    B)  100     

    C)  25       

    D)  900

    Correct Answer: D

    Solution :

    [d] Least number which is divisible by 4, 6, 10, 15 is LCM (4, 6, 10, 15) LCM (4, 6, 10, 15) = 60 \[60=2\times 2\times 3\times 5\] Here we find that 3 and 5 occurs alone. So, if we multiply 60 by \[3\times 5=15,\]We get a perfect square no. \[\therefore \] \[60\times 3\times 15=900\] 900 is the least square no. which is divisible by 4, 6, 10 and 15.


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