The average age of 50 pupils in a class is 10.5. If the class teacher is included, the average increases by 5. Then the age of the class teacher is?

The average age of 50 pupils in a class is 10.5. If the class teacher is included, the average
increases by 5. Then the age of the class teacher is?
 A ) 37
 B ) 36
 C ) 38
 D ) 40

36

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