Ballpark #54 — answers
September 17, 2026 · five estimation questions and their accepted values
Question 1
How long is the world’s longest zip line, in meters?
2830
Jebel Jais Flight in the UAE.
Question 2
How many pieces are in the largest commercial jigsaw puzzle?
54000
Question 3
How many liters does a typical car fuel tank hold?
55
Question 4
How much does the heaviest bony fish, the ocean sunfish, weigh, in kilograms?
2300
Question 5
How many years did it take to build Notre-Dame de Paris?
182
Roughly 1163 to 1345.
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