Johnny and his Dad were at a carnival and both of them went to a booth where a carny said to the Johnny, "If I can write your weight on a piece of paper, you have to give me $100, however If I fail, I'll give you $200.? Johnny?s Dad looked around and saw no scale so he tells Johnny to agree, thinking no matter what the carny writes, Johnny can just say he weighs more or less. In the end result, Johnny?s Dad ended up paying the carny $100. How did the carny win the bet?
A snail is at the bottom of a twenty meter deep pit. Each day the snail is capable of climbing five meters toward the top, unfortunately at night the snail slides four meters downwards again. How many days will it take the snail to reach the top of the pit?