Place six cups in a row, with every second one turned down, as shown. Ask Cub Scouts to see if they can get the three cups that are turned the same way together in the row by moving two cups at a time in only three moves.
Solution Move 4 and 5 to the right of 6; then 1 and 2 between 3 and 6; then 3 and 1 to the right of 5.