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The average age of 12 boys is 10 years. Out of these the average age of 11 boys is 9 years. Find the age of the 12th boy?1. 25 years2. 33 years3. 21 years4. 24 years |
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Answer» Correct Answer - Option 3 : 21 years Given: Average age of 12 boys = 10 years Average age of 11 boys = 9 years Formula used: Sum of ages = Average age × Number of persons Calculation: Total age of 12 boys = 10 × 12 ⇒ 120 years Total age of 11 boys = 9 × 11 ⇒ 99 years Age of 12th boy = (120 – 99) years ⇒ 21 years ∴ The age of 12th boy is 21 years |
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