1.  A number is doubled and 9 is added. If the resultant is trebled. it becomes 75. What is that number?
A. 3.5
B. 6
C. 8
D. None of these

Answer: Option C

Explanation:

Let the number be x Then,

3(2x + 9) =75

<=> 2x + 9 = 25

<=> 2x = 16

<=> x = 8