Today is 22 October 2014, the 295th day of the year.
 

 

 



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Sally Simplewit's Uncle Melvin has a collection of 100 toy soldiers in 10 boxes, 10 to a box. All of them are painted in bright colors, disguising the fact that the soldiers in just one of the boxes are made of solid silver, instead of tin like the others. And unfortunately, Uncle Melvin has lost track of which box contains the silver ones.
But Sally (scientist in training) knows that each tin soldier weighs 10 grams, while the silver ones weigh 11 grams each. So, she removes one or more soldiers from each box, stacks all of them together on the scale and weighs them. She then immediately tells Uncle Melvin which box has the silver soldiers.
Today's challenge: How did Sally know which box from simply weighing soldiers from each box all together?

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Solution to yesterday's challenge



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