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    Maths-
    General
    Easy

    Question

    Find the least no. of students in a class such that they stand in rows of 15, 20, 25 and form a perfect square.

    1. 800
    2. 500
    3. 900
    4. 300

    The correct answer is: 900

      LCM (15,20,25)
      3          15       20       25
      5          5          20       25
      2          1          4          5
      2          1          2          5
      5          1          1          5
      1          1          1
      LCM = 3*5*2*2*5=300
      To make 300 perfect square (according to ques), we need to multiply it by 3
      300 * 3 =900

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