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`

Options

A. 39 years
B. 41 years
C. 40 years
D. 44 years

Answer

B

Explanation

19 Total age of boys
`=19xx21=399` years
Total age of 19 boys and teacher
`=20xx22=440` years
`:.` Teacher.s age= 440-399
=41 years