Hello! The following question was asked in a Soviet Union mathematics Olympiad about 2-3 decades ago. A friend brought it up a few days ago and it has been bugging us since then. The problem goes along the lines of: "There are 10 ammo boxes each containing 10 bullets, and each bullet weighs 10 grams. However, one of the boxes contains defective bullets which weigh 9.9 grams each. Being allowed to use a scale only ONCE, find the ammo box containing the defective bullets" - The scale is not a balance scale - One use of scale refers to one reading This is more of a logic problem then mathematical, but as I said it was in the math competition.