Question

Cuvintele care nu se vad sunt: 3 ciocolate si 4 napolitane costa 10,25 lei, iar 7...​

Answer 1

c=ciocolata;

n=napolitana;

3c+4n=10.25 | inmultim cu -2 (metoda reducerii, se vor reduce napolitanele)

7c+8n=23.45

=>-6c-8n=-20.50

    7c+8n=23.45

________________

(le adunam)

=>c=2.95 lei