Choose the correct answer from the alternative given. 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:
11 years
4 years
15 years
14 years
A
11 years
B
15 years
C
14 years
D
4 years
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Solution
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Total age of 15 students 15 × 15 225 years. Total age of 5 students = 5 × 14 = 70 years Total age of other 9 students = 9 × 16 144 years Age of 15th student 225 (70 + 144) =225234= 11 years. Hence, the age of 15th student is 11 years.
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