Răspuns :

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 !