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O-waga Oli
J-waga Julii
A+O=61
J+O=54
A+J=55
A=61-O
O=54-J
J=55-A
A=61-(54-J)
A=61-54+J
A=7+55-A
A+A=62
2A=62/:2
A=31
J=55-A
J=55-31
J=24
O=54-J
O=54-24
O=30
0dp.Ania waży 31kg,Ola 30kg a Julia 24kg