Place 10 balls in 5 lines in such a way that each line has exactly 4 balls on it.

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In a neighborhood, each person needs to have a house number (in words) at their doors. At the store where the letters are bought, each letter is a different cost. Mike, who lives in the neighborhood, goes to buy letters for his house number and finds three of his neighbors in line to get theirs. The first neighbor's house number is “ELEVEN” and he paid $5, the second neighbor's is “ONE” and he paid $2, and the third neighbor's is “TWO” and he paid $3. If Mike's house number is “TWELVE”, how much did he spend on those letters?

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Three people check into a hotel room. The clerk says the bill is $30, so each guest pays $10. Later the clerk realizes the bill should only be $25. To rectify this, he gives the bellhop $5 to return to the guests. On the way to the room, the bellhop realizes that he cannot divide the money equally. As the guests didn't know the total of the revised bill, the bellhop decides to just give each guest $1 and keep $2 as a tip for himself. Each guest got $1 back: so now each guest only paid $9; bringing the total paid to $27. The bellhop has $2. And $27 + $2 = $29 so, if the guests originally handed over $30, what happened to the remaining $1?

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