Question
There are 25 students in a class with an average age of
20 years. 5 more students join the class, reducing the average to 18 years. Find the average age of the new students.Solution
Initial sum = 25 × 20 = 500 years
New average = 18 years
New strength = 30
New total = 30 × 18 = 540 years
Age of new = 540 - 500 = 40 years
Average = 40 ÷ 5 = 8 years
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