| The Trick: Take
any calendar. Choose 9 days that form a square like the
ones below. Add all nine numbers and then divide by the number in
the middle.
| 13 |
14 |
15 |
| 20 |
21 |
22 |
| 27 |
28 |
29 |
The Answer: You always get nine.
Hint: The middle number can be anything, so go
ahead and call it: n
|