Răspunsuri

2014-10-23T08:41:28+03:00
Fie x pretul initial al obiectului.
x+20/100x=48
x+1/5x=48
x(1+1/5)=48
x(5/5+1/5)=48
x(6/5)=48
x=48/ 6/5
x=48* 5/6
x=40lei
2014-10-23T08:45:20+03:00
X+20%x=48     x+\frac{20}{100}x=48   (Aducem la acelasi numitor si facem adunarea...)   \frac{120}{100}x=48x= \frac{48*100}{120} x= \frac{48+10}{12} =4*10=40