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.
- 800
- 500
- 900
- 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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