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2x - cena Ołówka
2,40 - Cena obu artykułów
2,40 = x + 2x
2,40 = 3x
x = 0,80
0,80 - Cena Gumki
0,80 * 2 = 1,60 - Cena Ołówka
Pozdrawiam.
3x=2,40
x=2,40/3
x=0,80 <- cena gumki
2x=1,60 <- cena ołówka
2x - cena ołówka
x + 2x = 2,40
3x = 2,40
x = 2,40/3 = 0,80 zł
2x = 2 razy 0,80 = 1,60 zł
odp
gumka = 0,80 zł , ołówek = 1,60