Un elev a citit 60% dintr-o carte , adica 120 pagini. Aflati numarul paginilor cartii.

120..................60% X......................100% (120x100):60=12000:60=200 pagini 

fie x -numarul total al paginilor 60 supra 100=120 supra x se face produsul mezilor =produsul extremilor asa: 60x=100*120                                                                                  60x=12000                                                                                  X=12000: 60                                                                                   X=200 Sper ca te-am ajutat !