Riddle: Look at this sequence; I6, 06, 68, 88, X, 98. What does the X represent?
Answer: The answer is 87, in order to solve this you need to look at the numbers upside down. The sequence comes out to be 86, ?, 88, 89, 90, 91; therefore the ? is 87.
Riddle: Each day many people come and visit me, however they usually only stay for a few minutes. I am considered by many to be very dirty yet few people would want to live without me. What am I?