Prima zi:
250-(20/100)*250=250-5000/100=200-asta va fi restul.250-200=50 pagini
200-(60/100)*200=200-12000/100=200-120=80.
50+80=130
250-130=120 pagini in a treia zi (a)
Verificam cat % reprezinta cele 120 pagini cu regula de 3 simpla:
250.....100%
120.....x%
x=120*100/250=12000/250=48%