The average age of child in a classof 30 is 11. The average including the teacher is 12 Howold is tge teacher
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Soln. :
Average age of 30 students=9
Total age of 30 students = 30 ×9=270 (1)
Average including teacher (31 person, 30 students + 1 teacher) =10
Total age including teacher=31×10=310
Age of 30 students + age of teacher =310
By(1) Replace Age of 30 students with 270
270 + Age of teacher = 310
Age of teacher =310–270=40. Ans….
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Answer:
age of teacher is 42 years
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