Question: A family has three children with ages 5, 10, and 15. If they have another child, what age must the new child be to maintain an average age of 10? (2023)

Options:

1. 5
2. 10
3. 15
4. 20

Correct Answer: 5

Exam Year: 2023

Solution:

Current total age = 5 + 10 + 15 = 30. To maintain an average of 10 with 4 children, total age must be 40. Therefore, the new child\'s age must be 40 - 30 = 10.