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The average age of 20 students in a class is 15 years. The average of 16 students is 12. What is the average age of remaining 4 students?

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Detailed Solution

Solution: Age of 20 students $= 15 \times 20 = 300 y e a r s$

Age of 16 students $= 16 \times 12 = 192 y e a r s$

Age of 4 students $= 108 y e a r s$

Average age of 4 students $= \frac{108}{4} = 27 y e a r s$

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