Question

Dupa o scumpire cu 10%,o ciocolata costa 1,65 lei.Cat costa inainte de scumpire?

 

Answer 1

100%+10%=110%
110%..............1,65 lei
100%............. x lei
________________________
x=100x1,65:110
x=1,5(lei costa inainte de scumpire)

Answer 2

a+10/100*a=1,65
a+a/10=1,65
11a/10=1,65(faci produsul mezilor cu prod extremilor)
11a=16,5  /: 11
a= si faci si tu 16,5 impartit la 11care ne da
a= 1,5 lei