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Andrei si Mihai cantaresc impreuna 76 kg , Mihai si Rares cantaresc impreuna 78 kg, iar Andrei si Rares cantaresc impreuna 82 kg. Cate kilograme cantareste fiecare?

Răspuns :

A+M=76
M+R=78
A+R=82

2A+2M+2R=76+78+82
2(A+M+R)=236
A+M+R=118
R=118-76
R=42

A=118-78
A=40

M=118-82
M=36