Question
The average age of a group of 10 students is 20
years. Two persons of age 25 years and 20 years, left the group and 2 persons of age 26 years and 29 years, joined the group. Find the new average age of the group.Solution
Required average = {(10 × 20) – 25 – 20 + 26 + 29}/10 = 21 years
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