1. The problem asks: What two numbers add up to 56? 2. The formula for addition is $a + b = 56$, where $a$ and $b$ are the two numbers. 3. There are infinitely many pairs $(a,b)$ that satisfy this equation. For example, if $a = 20$, then $b = 56 - 20 = 36$. 4. Another example: if $a = 0$, then $b = 56 - 0 = 56$. 5. In general, for any number $a$, the other number $b$ is $b = 56 - a$. 6. This means any two numbers whose sum is 56 satisfy the problem's condition.