Question : If $4x^{2}=15^{2}–9^{2}$, then the value of $x$ is:

Option 1: 9

Option 2: 6

Option 3: 3

Option 4: 12

Question : If $14 : 30 :: 7 : x$, then what is the value of $x$?

Option 1: 15

Option 2: 21

Option 3: 9

Option 4: 12

Question : If 10% of $x$ is 3 times of 15% of $y$, then find $x:y$.

Option 1: $7:2$

Option 2: $9:2$

Option 3: $8:3$

Option 4: $11:4$

Question : X is directly proportional to the square of Y. When X is 12, then Y is 2. Find the value of X when Y is 3.

Option 1: 30

Option 2: 9

Option 3: 27

Option 4: 18

Question : The mode of the following data is __________.
13, 15, 31, 12, 27, 13, 27, 30, 27, 28 and 16

Option 1: 28

Option 2: 27

Option 3: 30

Option 4: 31