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y-wiek dziadka
z-wiek wnuczka
5z=x
8z=y
x+y+z<112
x+y+z>84
5z+8z+z<112
5z+8z+z>84
14z<112
14z>84
z<8
z>7
z=6
Odp. Wnuczek ma 6 lat
5x - ojciec
8x - dziadek
x+5x+8x<112
14x<112/:14 14x>84 /:14
x<8 x>6
8>x>6
x = 7
Odp. Wnuk ma 7 lat