Question

dupa scumpirea cu 20 procente un obiect costa 450lei . cit costa obiectul pina la scumpire

Answer 1

x+20%x=450

x+20/100x=450 (simplificam cu 20)

x+1/5 x=450 ( aducem la acelasi numitor comun)

6x=2250

x=375 ( atat a costat obiectul inainte de scumpire)

proba:

375x20%=75

375+75=450 lei

Answer 2

x+20\100*100=450
100x*100+20\100=450
120x\100=450
450=120-x\100
x=450-120\100
x=330\100