The average age of 30 students is 9 years .If the age of their teacher is included, it becomes 10 years. The age of the teacher (in years) is?
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Answer:
29 is age of the teacher .
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Answer:
40 years
Step-by-step explanation:
by using the average formula ...
sum of the ages of 30students is 9*30=270
the sum of the ages of the students including their teacher is 31*10=310
just by subtracting 310-270=40years is the age of their teacher
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