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Solution of Puzzle 2: the Birthday Celebration
Back to the question
| Age of the elderly gentleman: 84 |
| He calls 9 sons and 4 daughters on his own. |
| |
| Because the journalist knows the age of the elderly gentleman, but he
had not enough data to calculate the number of children, there are at least two possibilities for each age of the gentleman: |
| age |
sons |
daughters |
| 32 |
5 |
4 |
| 32 |
6 |
2 |
| |
|
|
| 42 |
6 |
4 |
| 42 |
7 |
1 |
| |
|
|
| 62 |
7 |
5 |
| 62 |
8 |
3 |
| |
|
|
| 72 |
7 |
6 |
| 72 |
9 |
1 |
| |
|
|
| 84 |
7 |
7 |
| 84 |
9 |
4 |
| |
|
|
| 92 |
9 |
5 |
| 92 |
10 |
2 |
| Only at the age of the celebrated gentleman of 84 the journalist is able to know the number of children
after he gets knowledge that there are more sons then daughters. |
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