Ballpark #41 — answers
September 4, 2026 · five estimation questions and their accepted values
Question 1
How large is Vatican City, in square kilometers?
0.49
The smallest sovereign state in the world.
Question 2
How many stations does the Paris Métro have?
310
Around 310 across 16 lines.
Question 3
How many liters does a standard bathtub hold?
150
Question 4
How many times per second does a housefly beat its wings?
200
Question 5
How old was the oldest person ever recorded, in years?
122
Jeanne Calment, 122 years and 164 days.
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