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The average age of seven boys sitting...

The average age of seven boys sitting in a row facing North is 26 years. If the average age of the first three boys is 19 years and the average age of the last three boys is 32 years, what is the age of the boy who is sitting in the middle of the row? (a) 24 years     (b) 28 years    (c) 29 years (d) 31 years       (e) None of these

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