Question
Average age of a class of 35 students is 15 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 = 35 × 15 = 525 years Sum of the ages of the students along with teacher = 36 × 16.5 = 594 years So the age of the teacher = 594 – 525 = 69 years
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