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.
Source: Fekraneh.ir
Answer
- Set number from 1 to 10 to each box.
- pick cubes from from boxes with the equal amount of number of each box, and put them on scale.
read the last digit of shown number on the digital scale, and subtract this amount from 10. (e.g. weight=543 grams => 10 - 3 = 7 )
The signle digit result will lead us to the 9 gram cubes box
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