Book Maths Puzzle

The Average age of a class of 22 subjects in 21 years. The average increased by 1 when the teacher's age also included. What is the age of the teacher?

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Book Other Question

A is two years older than B who is twice as old as C. The total of the ages of A, B and C is 27. How old is B? How many seconds will a 500 meter long train moving with a speed of 63 km/hr, take to cross a man walking with a speed of 3 km/hr in the direction of the train ?