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Q.

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

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a

39 years

b

41 years

c

40 years

d

44 years

answer is B.

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Detailed Solution

Total age of 19 boys = 19 x 21 = 399 year 

Total age including teacher's = 20 x 22 = 440 

∴ Teacher's age = 440 - 399 = 41 years

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