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2016-02-26T21:26:27+05:30

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Average 10 students age = 13 years
Therefore 10 students age = 130 years
Average 15 students age = 11 years 4 months = 11.3 yrs
Therefore 15 students age = 169.5 years

Total students in class = 10 + 15 = 25
Total age of students in class = 130 + 169.5 = 299.5 years
Therefore average age of a student =  \frac{299.5}{25} = 11.98 years
On simplifying 11.98 yrs = 11 years 11 months 22 days 19 hours 12 minute :D
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