The average age of 30 boys of a class is 14 years. if the age of the class teacher is also included, the average age of the class becomes 15 years.find the age of the class teacher.
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sum of ages=14×30=420
new avg=15×31=465
age of teacher=465-420=45
new avg=15×31=465
age of teacher=465-420=45
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45 is the age of class teacher
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