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x- dziadek
y - babcia
x + y =150
x - 5 = y + 5 => x = y + 10
y + 10 + y = 150
2y = 140 => y = 70 (babcia)
x + 70 = 150
x = 80 (dziadek)
10+x - wiek dziadka
10+x+x=150
x+x=150-10
2x=140/:2
x=70
Odp:Babcia ma teraz 70 lat