Uploaded June 2019 | Updated September 2026, 1 week ago
You have 10 identical boxes full of balls, from 10 different manufacturers. The balls are 10 grams each.
One manufacturer contacts you because they’ve found that their balls are defective. So one of the 10 boxes contains balls that are only 9 grams each.
Now you must find out which box that contains the defective balls.
You have access to a digital scale, but you are only allowed to use it once.
How can you identify the box with the defective balls using the scale only once?
You have 10 identical boxes full of balls, from 10 different manufacturers. The balls are 10 grams each.
One manufacturer contacts you because they’ve found that their balls are defective. So one of the 10 boxes contains balls that are only 9 grams each.
Now you must find out which box that contains the defective balls.
You have access to a digital scale, but you are only allowed to use it once.
How can you identify the box with the defective balls using the scale only once?
