3QUESTION 3 OF 3
Answer & explanation
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
880,000
bicycles
How to estimate it
Fermi’s official “Napkin math”
Start with Amsterdam's population, a bit under a million. How many of them own a bike? Almost everyone, and plenty own two, a good one plus a beater to leave at the station.
- Amsterdam's population
- ≈ 900,000
- Bikes per person
- × 1
- 900,000 × 1
- ≈ 900,000
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- City of Amsterdam resident survey estimate
- ≈ 881,000 bicycles
- Cross-check: 443,000 households × 1.9 bikes each (CBS)
- ≈ 847,000
- ≈
- 880,000
Reference cited by Fermi: CROW-Fietsberaad · City of Amsterdam survey estimate
How close was your guess?
Your comparison will appear here.
Compare by ratio: divide the larger number by the smaller one. The closer to 1×, the better.