Zadanie
x - wiek córki
3x - wiek pani Ali
5(x-5) = 3x - 5
5x - 25 = 3x - 5 l +25
5x = 3x + 20 l -3x
2x = 20 l :2
x = 10 lat - wiek córki
3x = 3 · 10 = 30 lat - wiek pani Ali
Odp. Pani Ala ma teraz 30 lat, a jej córka 10 lat.
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Zadanie
x - wiek córki
3x - wiek pani Ali
5(x-5) = 3x - 5
5x - 25 = 3x - 5 l +25
5x = 3x + 20 l -3x
2x = 20 l :2
x = 10 lat - wiek córki
3x = 3 · 10 = 30 lat - wiek pani Ali
Odp. Pani Ala ma teraz 30 lat, a jej córka 10 lat.