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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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