Pies Reksio jest o 5 lat starszy od kota Filemona. Rok temu pies był dwa razy starszy od kota. Ile lat ma kot Filemon.?
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R = F + 5
R-1 = 2(F - 1)
F+5 -1 = 2F - 2
F = 5 - 1 + 2 = 6 lat
R = F + 5 = 11 lat
R - Reksio
F - Filemon
R = F + 5
R-1 = 2(F-1)
R= F+5
R-1 = 2F - 2
R = F+5
R=2F - 1
2F - 1=F+5
R=2F - 1
F = 6
R = 2x6 - 1
F=6
R = 11