Question
The average age of a group of 20 students is 25
years. Two persons of age 40 years and 30 years, left the group and 2 persons of age 60 years and 50 years, joined the group. Find the new average age of the group.Solution
Required average = {(20 × 25) – 40 – 30 + 60 + 50}/20 = 27 years
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