UP Police Constable Exam Model Paper 1

Given:
The divisor is 15, 20, 21, 25, and 30
Calculation:
First, find the LCM of 15, 20, 21, 25, and 30

⇒ 2 × 2 × 3 × 5 × 5 × 7
⇒ 2100
Now, we see that for making the perfect square multiply by 3 and 7
⇒ 2100 × 3 × 7
⇒ 44100
∴ The required perfect square number is 44100.