Question
The average age of 30 students in a class is 18 years.
The average age of another 20 students is 22 years. Find the average age of all the 50 students together.Solution
Sum of ages of first group = 30 × 18 = 540 Sum of ages of second group = 20 × 22 = 440 Total sum = 540 + 440 = 980 Total students = 30 + 20 = 50 Overall average = 980 / 50 = 19.6 years.
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