Question

The sum of two numbers is -12. One of the numbers is 4. What is the other number?

Answer 1

This could be done in two ways. If the first number is 4, then you could add 4 with -16. 4 + (-16) is -12. But it could also be -16 + 4, which still equals to -12.

But in the end, your answer is the same : -16 is the other number.