Question
The average age of a group of 20 students is 30
years. Two persons of age 50 years and 60 years, left the group and 2 persons of age 50 years and 40 years, joined the group. Find the new average age of the group.Solution
Required average = {(20 × 30) – 50 – 60 + 50 + 40}/20 = 29 years
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