The average age of 30 students is 9 years. If the age of their teacher is included, the average age become 10 years. The age of the teacher ( in years ) is

The average age of 30 students is 9 years. If the age of their teacher

1.	The average age of 30 students is 9 years. If the age of their teacher is included, the average age become 10 years. The age of the teacher ( in years ) is
A.	34 years
B.	36 years
C.	37 years
D.	40 years
Answer» E.

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The average age of 30 students is 9 years. If the age of their teacher is included, the average age become 10 years. The age of the teacher ( in years ) is

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