There is a pile of 100 masses, and 4 of them are slightly heavier than the others. The 96 'true' masses are identical to eachother in weight, and the 4 'fakes' are slightly heavier than the others, but also identical to eachother in weight. Using 2 measurements on a balance scale, identify at least one 'true' mass.
As a follow-up, you can try to identify a collection of true masses, how many can you find in those two measurements? For rules on the balance scale, it is the same as the old one from the counterfeit masses puzzle.
I know that typically people make the counterfeits lighter than the genuine ones, but then it screws me up when I write the solution because I want the heavy ones to be the odd ones out.
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