SVP je ne comprend pas                             Choisir un nombre                        7      
                                                                                    Tripler ce nombre                         21
                                                                                    Ajouter quatre au résultat      25
                                                                                    Doubler le tout                              50
                                                                                    Retrancher le produit du         ??
                                                                                    nombre de départ par 6           ??