If the ages of 3 persons are 17, 16, and 12, and another person is added making the average age 20, what is the age of the new person?
Answer: 35
Explanation
Total of 3 ages = 17 + 16 + 12 = 45
New average = 20, for 4 people → Total = 20 × 4 = 80
Age of 4th person = 80 − 45 = 35
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