Question

90 fire de garoafe si 30 fire de cale costa 540 lei,iar 70 fire de garoafe si 10 fire costa 340 de lei.
Cat costa un fir de garoafe si cat costa unit de Cala?

Answer 1

Răspuns:

Garoafe : G

Cale : C

90G + 30C = 540

70G + 10C = 340

3G + C = 18

7G + C = 34

C + 3G = 18

C + 7G = 34

-4G = -16

G = 4

3(4) + C = 18

12 + C = 18

C = 18 - 12

C = 6