Question : What is the least number of students in a class such that they can make rows of 10,15 and 20 and also the total number of students is a perfect square?

Option 1: 6400

Option 2: 1600

Option 3: 900

Option 4: 1800

Question : A number, when subtracted from 3 times the second number, gives a result equal to $\frac{3}{4}$ of the first number. What is the ratio of the first number to the second number?

Option 1: 11 : 6

Option 2: 12 : 7

Option 3: 9 : 5

Option 4: 10 : 7

Question : What is that least perfect square which is exactly divisible by each of 14, 84, and 28?

Option 1: 7056

Option 2: 3528

Option 3: 1764

Option 4: 441

Question : What is that least perfect square, which is exactly divisible by each of 12, 84 and 24?

Option 1: 2304

Option 2: 7056

Option 3: 11664

Option 4: 1764

Question : What is the smallest perfect square number that is divisible by both 10 and 15?

Option 1: 1200

Option 2: 1800

Option 3: 360

Option 4: 900