Question: The sum of two numbers is 20, and their difference is 4. What are the two numbers?

Options:

1. 10 and 10
2. 12 and 8
3. 14 and 6
4. 16 and 4

Correct Answer: 12 and 8

Solution:

Let the two numbers be x and y. We have the equations: x + y = 20 and x - y = 4. Adding these gives 2x = 24, so x = 12. Substituting back gives y = 8.