Question
The average age of a group of 10 students is 12 years.
Two persons of age 15 years and 20 years, left the group and 2 persons of age 54 years and 101 years, joined the group. Find the new average age of the group.Solution
Required average = {(10 × 12) – 15 – 20 + 54 + 101}/10 = 24 years
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