Ballpark #3 — answers
July 28, 2026 · five estimation questions and their accepted values
Question 1
How long is the Amazon River, in kilometers?
6400
Commonly cited estimate; the exact length is debated.
Question 2
How much can a large adult blue whale weigh, in tonnes?
150
Large adults; the biggest recorded approached 199 tonnes.
Question 3
How many floors does the Burj Khalifa have?
163
Question 4
How many steps lead to the top of the Eiffel Tower?
1665
Question 5
How many times does the average human heart beat per day?
100000
At ~70 beats per minute.
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