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The average age of 15 students of a class is 15 years. Out of these the average age of 5 students is 14 years and that of the other 9 students is 16 years. The age of the 15th student is
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- 11 years
- 15 years
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15 2 year 7
- 14 years
- 11 years
Correct Option: A
Given that , The average age of 15 students = 15 years.
Total age of 15 students = 15 × 15 = 225 years.
The average age of 5 students = 14 years.
Total age of 5 students = 5 × 14 = 70 years
The average age of 9 students = 16 years.
Total age of other 9 students = 9 × 16 = 144 years
∴ The age of 15th student = 225 – (70 + 144) = 225 – 214 = 11 years.
