Question

4 sticle de lapte si 3 sticle de iaurt costa 52 lei , iar 3 sticle de lapte si 4 de iaurt costa 53 lei atunci cat costa o sticla de iaurt? urgent va rog!!!

Answer 1

Răspuns

Raspuns  -   8 lei costa o sticla de iaurt

                 -  7 lei costa 1 sticla de lapte

Explicație pas cu pas:

4 sticle lapte ----------3 sticle iaurt---------------52 lei   \ *(-3)

3 sticle lapte------------4 sticle iaurt --------------53 lei    \  *4

-------------------------------------------------------------------------------------------

-12 sticle lapte---------  -9 sticle iaurt------------   -156 lei

12 sticle lapte--------------16 sticle iaurt-------------212 lei

---------------------------------------------------------------------------------

         \                             7 sticle iaurt-------------56 lei

1 sticla iaurt=56\7=8 lei

1 sticla iaurt=8 lei

4 sticle lapte-----------24 lei iaurt----------52 lei

4 sticle lapte=52 lei-24 lei=28 lei

1 sticla lapte=28\4=7 lei

1 sticla lapte=7 lei