Ballpark #4 — answers
July 29, 2026 · five estimation questions and their accepted values
Question 1
How many islands does Indonesia have?
17000
Official counts hover around 17,000.
Question 2
What is the speed of light, in kilometers per second?
299792
Question 3
How many teeth does an adult human have, including wisdom teeth?
32
Question 4
How long is the Great Wall of China including all branches, in kilometers?
21196
Official 2012 survey figure.
Question 5
What is the population of Australia, in millions?
27
2024 estimate.
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