Question
A group of 35 people has an average age of 28 years.
Later, 7 more people join the group and the average age becomes 25 years. What is the average age of the new people?Solution
Initial sum = 35 × 28 = 980 years
New average = 25 years
New total = 42
New total age = 42 × 25 = 1050 years
Sum of new = 1050 - 980 = 70 years
Average = 70 ÷ 7 = 10 years
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