Question

suma a trei numere este 999
 
 suma primilor doi termeni este 658(Andrei)
suma ultimirilor doi termeni este 504(Florin)                                                                                                                                                    

Answer 1

a+b+c=999
a+b=658
b+c=504
inlocuim a+b si b+c in relatia a+b+c
658+c=999
c=341
a+504=999
a=495
495+b=658
b=163

Answer 2

a+b+c=999                                                                                                                           a+b=658                                                                                                                             b+c=504                                                                                                                              c+504=999                                                                                                                          c=999-504                                                                                                                  

c=495                                                                                                                                    b+658=999                                                                                                                     b=141                                                                                                            a+495+141=999                                                                                                             a+636=999                                                                                                                      a=999-636

a=363