Correct Answer - Option 1 : 54

**Given:**

Average age of 10 persons = 32 years

Average age of 11 persons including instructor = 34 years

**Formula used:**

Average age = Sum of the ages of persons/No of persons

**Calculation:**

Total age of 10 persons = 32 years × 10 = 320 years

Total age of 11 persons including instructor = 34 years × 11 = 374

**∴ The age of instructor = 374 - 320 = 54 years**