How to Solve the two coins problem

Join Ty Yann and explore a coin puzzle with an unexpected answer. 1. Place a five hundred won coin on the top of another five hundred won coin. Make sure the top coin has the 500 level and showing. 2. Rotate the two coins, like a gear, and think of when the 500 will be straight again. 3. Will it be at quarter, a half, 3/4 or a full turn? Thing of your solution and then try it out. Were you correct?