This question already has an answer here:
- Coin weighing problem 2 answers
There are 10 Boxes, each contains 1000 sugar cubes. The sugar cubes in 9 of the boxes are 10 grams each and the other box has 9 gram cubes.
There is a digital scale that you can use it ONCE. (i.e. put something on the scale, turn it on and read the number)
Find the box with the 9 gram cubes.