Re-arrange the coins from the diamond shape so the coins are 4 in a row (it may be a slanted line). In each move, you have to slide a coin into a new position that is touching 2 other coins.
Move 2 coins so every coin touches exactly 3 coins.
In a game of 6 players lasting for 40 minutes, there are 4 reserves. They substitute each player, so that all players, including reserves, are on the pitch for the same length of time, how long is each player on the pitch?
Arrange the 6 matchsticks to form 4 equilateral triangles with an edge length equal to that of a single matchstick. Hint: you are allowed to use glue.
Can you add 6 matchsticks to divide the square into 4 pieces with EQUAL shape and ONE coin each?
