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y - waga Bogdana
x+y=70
x+4=y-3
x=70-y
70-y+4=y-3
77=2y
y=38,5 kg
x=70-38,5
x=31,5 kg
Ania waży 31,5kg, a Bogdan 38,5kg.
x+4kg x-3kg 7
ania 31
70:2=35
35+3
35-4=31
38-3=35
31+4=35
ania waży 31kg a bogdan 38