Odyssey
				Riddle:  Alone I am 24th. With a friend, I am 20. Another friend, and I am unclean. What am I?
			
			
								 	Answer: The letter X. It is the 24th letter of the alphabet, XX in Roman numerals is 20, and XXX is a label for movies that are inappropriate (unclean).
								Source: https://riddles.com/index.php/5876
			
			
					
					
										
					
										
										
					
										
										
																				
							
							  
							
															
							