1. 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?
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By: anil on 05 May 2019 01.50 am
Average age of 19 boys = 21 years => Total age of 19 boys = $$21 imes19=399$$ years Let age of teacher = $$x$$ years Average of class including teacher = $$frac{399+x}{20}=22$$ => $$399+x=22 imes20=440$$ => $$x=440-399=41$$ years => Ans - (B)
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