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?
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?
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.