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cate numere de trei cifre impartite la 42 dau restul 30

Răspuns :

Alitta

n = numar de 3 cifre ;

n : 42 = c   (rest 30)  ;  100 < n < 999

                                               ↓

                                        (100-30) : 42 ≈ 1,6 ...

                                        (999-30) : 42 ≈ 23,07....

n = { 2*42+30= 114; 3*42+30= 156 ; ... ; 23*42+30= 996 }

                            total numere n = (23-2)+1 = 22