Joseph Fowler
10/15/2023 · Primary School
ractice Exercise The mean age of 30 students of a class is 10 years. If the age of their teacher is also included then the mean is increased by one year. What is the age of the teacher? \( \begin{array}{llll}\text { (A) } 21 \text { years } & \text { (B) } 22 \text { years } & \text { (C) } 41 \text { years } & \text { (D) } 42 \text { years } \\ \text { (E) None of these } & \text { (D) }\end{array} \)
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The age of the teacher is 41 years.
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