Multiple choice general knowledge math & puzzles How many times can you subtract 6 from 30. 5 0 1 4 Reveal answer Fill a bubble to check yourself C Correct answer Explanation This is a riddle. You can only subtract 6 from 30 'one' time, because after you subtract it, you are subtracting from 24, not 30. Mathematically, 30/6 is 5, but the riddle logic dictates the answer is 1.