Average age of a class of 25 students is 13 years. Average age of the class is increased by 30 months if the age of the teacher is included. Find the age of the teacher.
Sum of the ages of all the students in the class = 25 × 13 = 325 years Sum of the ages of the students along with teacher = 26 × 15.5 = 403 years So the age of the teacher = 403 – 325 = 78 years
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