Răspuns :
Explicație pas cu pas:
[tex]\frac{a}{1} = \frac{b}{4} = \frac{c}{7} = \frac{a + b + c}{147} = \frac{120}{12} = 10 \\ \frac{a}{1} = 10 \implies a = 1 \times 10 = 10 \\ \frac{b}{4} = 10 \implies b = 4 \times 10 = 40 \\ \frac{c}{7} = 10 \implies c = 7 \times 10 = 70[/tex]