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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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