In a class ,Average of 30 students is a 9 years of age. If the age of their teacher is included , it becomes 10 years of age. what is the age of the teacher?
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So, avg. of 30 students + one teacher = 10 years. => Total age of 30 students + one teacher = 10 * 31 = 310 years. Therefore age of teacher = (310-270) = 40 years.
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Answer:
So, avg. of 30 students + one teacher = 10 years. => Total age of 30 students + one teacher = 10 * 31 = 310 years. Therefore age of teacher = (310-270) = 40 years
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