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grupa2 - 5 kazdy
grupa3 - 4 kazdy
113 ryb wszyscy
16 rybaków
ukladamy uklad rownan z 3 niewiadomymi:
13 * (16 - x1) = 113 - [ 5 * (16 - x2)] - [4 * (16 - x3)]
5 * (16 - x2) = 113 - [ 13 * ( 16 - x1)] - [ 4 * (16 - x3)]
4 * (16 - x3) = 113 - [ 13 * ( 16 - x1)] - [ 5 * (16 - x2)]
jak rozwiazesz ten uklad to ci wyjdzie x1 to rybacy w pierwszej grupie, x2 - w drugiej, x3 - w trzeciej