Correct Answer - Option 4 : 27 years
Given:
3 years from Alka's birthday, she will be twice as old as she was 12 years ago
Calculation:
Let Alka’s age today be x years.
Then, Alka’ age after 3 year = (x + 3) years.
12 years ago, Alka's age = (x - 12) years
According to question:
⇒ x + 3 = 2 × (x - 12)
⇒ x + 3 = 2x – 24
⇒ x = 27