Question
The average age of a group of 20 students is 40 years.
Two persons of age 35 years and 30 years, left the group and 2 persons of age 40 years and 85 years, joined the group. Find the new average age of the group.Solution
Required average = {(20 × 40) – 35 – 30 + 40 + 85}/20 = 43 years
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