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bogdan-x
x+y=70
y+4=x-3
y- waga Bogdana
x+y=70 kg
x+4kg= y-3 kg
x= 70 - y
70- y + 4 = y-3
x= 70- y
-2y= -77 /:(-2)
x=70-y
y=38,5 kg
x= 70- 38,5
x= 31,5 kg
Odp Ania waży 31,5 kg a Bogdan 38,5 kg