MediumMath and Logic
How many ping pong balls fill a 747?
Riddle
How many ping pong balls fill a 747?
Choose an answer
A.1 million
B.10 million
C.500,000
D.~4.2 million
Hint: It's a word with 7 letters, starting with "~".
Answer
~4.2 million
Why this is the answer
Estimate the volume of a 747 (approx 1000 m^3) and the volume of a ping pong ball, then account for the 'packing fraction' of empty air space between balls.
This riddle is filed under Math Riddles and rated Medium.