Ballpark #1 — answers
July 26, 2026 · five estimation questions and their accepted values
Question 1
How tall is the Eiffel Tower, in meters?
330
Question 2
How long is a marathon, in kilometers?
42.2
Question 3
How many keys does a standard piano have?
88
Question 4
How many confirmed moons does Jupiter have?
95
As of recent counts; astronomers keep finding more.
Question 5
What is the speed of sound at sea level, in km/h?
1235
▶ Play today's Ballpark
Five new "how many?" questions every day. No signup.