Basia jest o 5 lat starsza od Agnieszki . Rok temu była 2 razy starsza od Agnieszki .Ile lat ma Agnieszka?
x wiek Agnieszki
x + 5 wiek Basi
x + 5 - 1 = 2(x - 1)
x + 4 = 2x - 2
x - 2x = -2 - 4
-x = -6
x = 6
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x wiek Agnieszki
x + 5 wiek Basi
x + 5 - 1 = 2(x - 1)
x + 4 = 2x - 2
x - 2x = -2 - 4
-x = -6
x = 6