Question
Average age of a class of 41 students is 17 years.
Average age of the class is increased by 18 months if the age of the teacher is included. Find the age of the teacher.Solution
Sum of the ages of all the students in the class = 41 × 17 = 697 years Sum of the ages of the students along with teacher = 42 × 18.5 = 777 years So the age of the teacher = 777 – 697 = 80 years
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