74088 = 2 x 2 x 2 x 3 x 3 x 3 x 7 x 7 x 7
= (2 x 2) x (3 x 3) x (7 x 7) x ( 2 x 3 x 7)

Correct Option: A

74088 = 2 x 2 x 2 x 3 x 3 x 3 x 7 x 7 x 7
= (2 x 2) x (3 x 3) x (7 x 7) x ( 2 x 3 x 7)
∴ Least number which should be multiplied to 74088 to make it a perfect suqare = 2 x 3 x 7 = 42

Let the number be x.
Then, accordingto the question,
x² = (75.15)² - (60.12)²

Correct Option: C

Let the number be x.
Then, accordingto the question,
x² = (75.15)² - (60.12)²
⇒ x² = 5647.52 - 3614.41
⇒ x² = 2033.11
∴ x = 45.09

Let the total number of soliders in front be x. Then, total number of soliders in form of solid square = x²
According to the question, x² + 31 = 16160

Correct Option: D

Let the total number of soliders in front be x. Then, total number of soliders in form of solid square = x²
According to the question, x² + 31 = 16160
⇒ x² = 16129 ⇒ x = √16129
∴ x = 127

Let the total number of subbscribers be x.
Then, x² = 2582449

Correct Option: A

Let the total number of subbscribers be x.
Then, x² = 2582449
⇒ x = √2582449 = 1607

Total collected amount = Rs. 29791
∴ Total number of student = ∛29791 = 31

Correct Option: B

Total collected amount = Rs. 29791
∴ Total number of student = ∛29791 = 31