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Jacek:15-2,5=12,5lat
Marek:15+2,5=17,5lat
12,5+17,5=30
odp.Jacek ma 12,5 lat a marek 17,5 lat
wiek Jacka = x - 5
razem = 30 lat
x + x - 5 = 30
2x - 5 = 30 |+5
2x = 35 |:2
x = 17,5
wiek Marka = 17,5 lat
wiek Jacka = 17,5 - 5 = 12,5 lat