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There are 30 students in a class. The average age of the first 10 students is 12.5 years. The average

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There are 30 students in a class. The average age of the first 10 students is 12.5 years. The average age of the next 20 students is 13.1 years. Find the average age of the whole class.

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Total age of 10 students
= 12.5 × 10 = 125 years
Total age of 20 students
= 13.1 × 20 = 262 years
 Average age of 30 students

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