Question

O cana costa cat 3 pahare,iar o farfurie cat 2 cani.Cat costa fiecare daca impreuna costa 40 lei?

Answer 1

40*3=120o cana
40*2=80 o farfurie
cind vom scadea 120-80=40

Answer 2

Notăm: c-cană
p-pahar
f-farfurie

c=3p
f=2c=2·3p=6p

c+p+f=40lei
3p+p+6p=40lei
10p=40lei
p=40lei:10=4lei

c=3·4lei=12lei
f=6·4lei=24lei