How many crates of beer for a birthday party?
The circle of chairs, the crisps and the question whether there's any beer left. With the Sum you won't be the host who has to announce it has run out.
Quick lookup
| Beer drinkers | Crates |
|---|---|
| 10 | 8 |
| 20 | 12 |
| 30 | 18 |
| 40 | 22 |
| 50 | 28 |
| 75 | 40 |
| 100 | 52 |
| 150 | 78 |
Tips
- Only count the beer drinkers, not the whole circle.
- In doubt? The number is always even, so you're never one crate short.
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