Question

The average age of 20 students is 12 years. If the teacher's age is included ,average increases by one. The age of the teacher is

• A. 30 years
• B. 33 years
• C. 32 years
• D. 35 years

Answer 1

Answer:

B. 33 years

Average of 20 students = 12 years Total age of 20 students = 20 × 12 = 240 years When teacher included average become 13 years Now, total age 20 students and teacher = 13 × 21 = 273 years ∴ Age of teacher = 273 - 240 = 33 years