This riddle has been around for some time on internet platforms such as Instagram, Facebook, and WhatsApp, and many people still argue over what the answer might be, as there are many possibilities. The correct answer is 28, 4, 17. Writing the 24th letter of the alphabet for each 24, the 22nd letter of the alphabet for each 22, and the 9th letter of the alphabet for each 9 reveals: XXVIII IV XVII It is now clear that the combination is written in Roman Numerals. The only set of 3 Roman Numerals that fits this arrangement is: XXVIII IV XVII or 28, 4, 17.