In a class, 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 ( A ) 40 ( B ) 31 ( C ) 35 ( D ) 27
Answers
Answered by
1
Answer:
total students=30*9
=270
total students and teachers=31*10
=410
the age of teachers=410-270=40
Answered by
1
Answer:
40 years
Step-by-step explanation:
The average age of 30 students=9 years
The total age of 30 students= 30×9=270 years
The total age of 30 students +1 teacher =31×10=310 years
So Teacher's age = (total students+teacher's age)-(total student's age)
Teacher's age= 310-270=40 years
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