What do you get when you subtract 30 from 30?

When you subtract 30 from 30, you are essentially calculating how much remains when you take away the entire amount from itself. The operation can be written mathematically as:

30 - 30 = 0

This equation shows that when you have a number and you subtract that same number, the result is zero. The concept can be understood as the idea of an equal amount being compared: if you have something and you remove exactly that same quantity, nothing is left. Thus, the correct answer is 0, as it reflects the outcome of this subtraction operation accurately.

Other numbers, such as 1, 3, and 4, do not represent the result of this subtraction, as they do not result from taking away the full amount of 30.