Ballpark #48 — answers
September 11, 2026 · five estimation questions and their accepted values
Question 1
How many runners finish the New York City Marathon each year?
55000
Question 2
How many sheets of paper are in a standard ream?
500
Question 3
What is the longest a total solar eclipse can last, in minutes?
7.5
The theoretical maximum for totality.
Question 4
How many atmospheres of pressure are at the bottom of the Mariana Trench?
1100
Question 5
How many terracotta warriors have been found at Xi’an?
8000
Estimated; excavation is still ongoing.
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