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?
Average age of 19 boys = 21 years
=> Total age of 19 boys = $$21\times19=399$$ years
Let age of teacher = $$x$$ years
Average of class including teacher = $$\frac{399+x}{20}=22$$
=> $$399+x=22\times20=440$$
=> $$x=440-399=41$$ years
=> Ans - (B)
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