Question:The average age of `24` boys and the teacher is `15` years. when the teacher,s age is excluded, the average decreases by `1`.What is the age of the teacher ? 

A `38 years` 
B `39 years` 
C `40 years` 
D Data inadequate 

+ Answer
B 

+ Explanation
Age of the teacher

`= (25 xx 15 - 24 xx 14)`

`= 39 years`

+ Report

Irin Moni

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