What does 30 minus the sum of 3 equal?

To determine the answer, first, you must calculate the sum of 3, which is simply 3 itself since there are no additional numbers involved in this situation.

Then, you take 30 and subtract this sum from it. The calculation would be:

30 - 3 = 27

Thus, the correct answer is 27. This illustrates a straightforward arithmetic operation where you subtract a single value from a larger one, highlighting the principle of basic subtraction in math.