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The average age of 20 persons is 18 years. A new person of 39 years has joined. What is the average age of all persons?1. 19 years2. 20 years3. 19.5 years4. 20.4 years |
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Answer» Correct Answer - Option 1 : 19 years Given: Average age of 20 persons = 18 A new person of 39 years Formula used: Sum of ages = Average age × Number of persons Calculation: Sum of age of all the 20 persons = 20 × 18 = 360 years After a 39 years person has joined Sum of all 21 persons = 360 + 39 = 399 years New average of all 21 persons = 399/21 = 19 years ∴ The new average age of all persons is 19 years |
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