Question

Andrei si Sori cantaresc impreuna 80 kg, Sorin si Radu cantaresc 84 de kg,iar Radu si Andrei cantaresc 86 de kg. Cate kg cantareste fiecare baiat?

Answer 1

A=Andrei         S-Sori    R=Radu                                                                                                           A+S=80kg     S+R=84kg                                                                                                        R+A=86kg                                                                                              2A+2S+2R=252kg ! :2                                                                                     A+S+R=126kg                                                                                                  80kg+R=126kg        R=126kg-80kg        R=46kg                                             S+46kg=84kg          S=84kg-46kg          S=38kg                              A+38kg=80kg          A=80kg-38kg          A=42kg                                              Proba: 46+38+42=46+80=126