Quote from Son of a Gann:
Total purchase
Choc 308
Sweets 68
Each has only Half
Sweets 34
Choc 154
Brilliant ! Now try this :
Obama, Clinton, & Bush had snacks for a miniscule $30. Each paid $10 to the waiter. Waiter gave the $30 to cashier. Cashier said bill should only be $25, asks the waiter to return $5 to them. Waiter thinks "how to split $5 among the three of them". Never mind, keep $2 to himself, returns $1 each to Obama, Clinton & Bush. Thus each of them paid $9, waiter keeps $2, total $29. What happened to the missing buck?