The average age of 3 friends is 23. Even if the age of the 4th friend is added, the average remains 23. What is the age of the 4th friend?
Answer: 23 years
Explanation
Sum of the ages of 3 friends =3×23= 69 years
Sum of the ages of 4 friends =4×23= 92 years
∴ Age of 4th friend = 92 years - 69 years = 23 years.
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