How much does each person have and please explain why?

Question

Christine, Milan, and Bill have a total of
$82
in their wallets. Bill has
3
times what Milan has. Christine has
$7
more than Milan. How much does each have?

Answer 1

Christine=C    Milan =M    Bill=B            C+M+B=82

C=M+7                           B=3xM           (M+7) +M+ (3xM)=82

                                                            M+7+M+3M=82

                                                            5M+7=82

                                                            5M=75

                                                              M=15

C=15+7=22      M=15     B=3x15=45                        22+15+45=82