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© examsnet.com
Question : 39
Total: 40
The average age of 30 students of a class is 23 years. Out of these, the average age of 10 students is 19 years and that of the other 19 students is 25 years. What is the age of the 30th student?
22.5 years
24 years
23 years
25 years
26 years
Validate
Solution:
Total age of 30 students = (30 × 23) years = 690 years
Total age of 10 students = (10 × 19) years = 190 years
Total age of 19 students = (19 × 25) years = 475 years
∴ Age of the 30th student = (190 + 475 - 690) years = 25 years
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