Book Maths Puzzle

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?

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Book Other Question

Present ages of Kiran and Syam are in the ratio of 5 : 4 respectively. Three years hence, the ratio of their ages will become 11 : 9 respectively. What is Syam's present age in years? 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?