Multiple choice general knowledge math & puzzles Digits on one hand (including thumb)+ number of cat's lives + wheels on a unicycle is? 12 13 14 15 Reveal answer Fill a bubble to check yourself D Correct answer Explanation A standard human hand has 5 digits. Folklore suggests a cat has 9 lives. A unicycle has 1 wheel. Summing these (5 + 9 + 1) equals 15.