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P+A=81 kg
M+A= 70 kg
A=81-P
A=70-M
P=125-M
A=81-125+M
A=70-M
81-125+M=70-M
81-125+M-70+M=0
-114+2M=0
M=114/2=57 kg ( Maria)
A=70-M= 70-57=13 kg ( bebe)