1.  Today is Varun's birthday. One year, from today he will be twice as old as he was 12 years ago. How old is Varun today ?
A. 20 years
B. 22 years
C. 25 years
D. 27 years

Answer: Option C

Explanation:

Let Varun's age today = x years.

Then, Varun's age after 1 year = (x + 1) years.

Therefore x + 1 = 2 (x - 12) => x + 1 = 2x - 24 => x = 25.