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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