KöMaL 2014 K433
We have four objects that look all alike, but weigh 3, 5, 8 and 11 kg. We also have an equal-arm balance without extra weights. By using the balance only twice, how can we identify the 11-kg object? With two further measurements, how can we determine the masses of the other objects, too?
Official text KöMaL. Quoted with source.
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