Question
Average age of 25 students is 15 years. If 5 students
leave the class, the average age decreases by 1 year. Find the average age of the students who left the class.Solution
ATQ, Total age of 25 students = 25 × 15 years = 375 years. New average age after 5 students leave = 14 years. Total age of 20 students = 20 × 14 years = 280 years. Total age of the 5 students who left = 375 − 280 years = 95 years. Average age of the 5 students who left = 95/5 years = 19 years.
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