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y-gruszki
x+y=30
3x+4y=110
x=30-y
3(30-y)+4y=110
90-3y+4y=110
y=110-90
y=20
x=30-20
x=10
Odp.: Jabłek jest 10 kg, a gruszek 20kg.
10*3=30
20*4=80
30+80=110.
proste ;]