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The average age of seven boys sitting in a row facing North is 26 yrs and the average age of the last three boys is 32 yrs. What is the age fo the boy

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The average age of seven boys sitting in a row facing North is 26 yrs and the average age of the last three boys is 32 yrs. What is the age fo the boy who is sitting in middle of the row ?
A. 28 yrs
B. 29 yrs
C. 24 yrs
D. 31 yrs
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Correct Answer - B
Age of the middle boy `=26xx7-(19xx3+32xx3)`
`=182-153=29 ` yrs
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