Five years ago, the average age of Puneet and Amrita was 15 years. Today, the average age of Puneet, Amrita, and Renu is 20 years. What will be Renu's age after 12 years?

Correct option is B

 
Given:
- Five years ago, the average age of Puneet and Amrita was 15 years.
- Today, the average age of Puneet, Amrita, and Renu is 20 years.
Formula Used:
1. Average age formula: Sum of ages = Average age × Number of people
2. To find Renu's current age and future age: Renu's age after 12 years = Current age of Renu + 12
Solution:
1. Calculate the sum of ages of Puneet and Amrita five years ago: Sum of ages of Puneet and Amrita (5 years ago) = 15 × 2 = 30
2. Their current ages sum (adding 5 years to each): Current sum of ages of Puneet and Amrita = 30 + 2 × 5 = 40
3. Calculate the current sum of ages of Puneet, Amrita, and Renu: Sum of ages of Puneet, Amrita, and Renu (today) = 20 × 3 = 60
4. Find Renu’s current age: Renu's current age = 60 - 40 = 20
5. Calculate Renu's age after 12 years: Renu's age after 12 years = 20 + 12 = 32 Answer: (b) 32 years