Răspunsuri

2014-02-12T15:58:26+02:00
4c + 6a = 440
a = c + 15

Inlocuim a in prima si obtinem:

4c + 6(c+15) = 440
4c + 6c + 90 = 440
10c = 250
c = 25 => a = 40

c - carte
a - album

Succes !