| Here are the answers to our bonus puzzles. To return to the puzzles, please click here. |
| Coins in the Dark |
| Separate the coins into group A with 10 coins and group B with 16 coins. If there are x heads in group A then there will be 10x heads in group B. Turn over all coins in group A and each will have 10x coins facing heads up. |
| Tennis Aces |
| Roddick is ahead 1-0 in the fourth set but down two sets to one. At 5-4 (or 5-0) in the 3rd set tiebreak game he served two aces to win the set. Then he served the first game of the 4th set with four more aces. |
| It's All Relative |
| The woman can be the man's daughter-in-law, wife's aunt (wife's mother's brother's wife), or nephew's wife (wife's sister's son's wife). Or, equivalently, the man can be the woman's father-in-law, niece's husband (husband's sister's daughter's husband, or aunt's husband (husband's mother's sister's husband). |
| Four Coins and Four Weighings |
| Weighing 1: A B vs. C D |
| Weighing 2: A C vs. B D |
| Weighing 3: A D vs. B C |
| After the first three weighings, call the common heavy coin d and the common light coin a. Of the four coins, d is the heaviest and a is the lightest. Order the two remaining coins in a 4th weighing. |
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