1. The first measurement is 3 on each side. If it balances then discard the donuts, and weigh the last 2 donuts. The heavy one would drop.
If it doesn't balance take the three on the heavy side an discard the other three. Weigh 2 of the 3 if they balance then the 3rd one is the heavy one. If they don't balance then the heavy one will drop.
2. 2.8 %
3. Move the three corner pennies to the opposite side of the triangle.
4.48 tiles
5. play 96 games. the number of games in a single elimination tournament you get is one less then the number of teams.
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