# The average age of 19 boys in a class is 21 years. If the teacher’s ag

| The average age of 19 boys in a class is 21 years. If the teacher’s age is included, the average increases to 22 years. What is the teacher’s age?

A. 39 years

B. 41 years

C. 40 years

D. 44 years

### Right Answer is: B

#### SOLUTION

Total age of 19 boys = 19 × 21 = 399 years

Total age of 19 boys and teacher

= 20 × 22 = 440 years

Teacher’s age = 440 – 399 = 41 years

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