You have a 100 coins laying flat on a table , each with a head side and a tail side . 10 of them are heads up , 90 are tails up . How would you split the coins into two piles such that there are the same number of heads in each pile ?
A babysitter came over to babysit 10 children . She decided to give them a snack . In a jar there are 10 cookies . She wants to give each child a cookie , but still keep one in the jar . How will she do it without breaking any cookie -LRB- i.e. each child has to get a whole cookie -RRB- ?