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 year and the average age of the past three boys is 32 years. what is the age of the boy who is sitting in w middle of the row
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first three boys total age =19*3=57
past three boys total age =32*3=96
total age of all 7 boys =27*7=182
age of boy who is in middle =182-(57+96)=29
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