Răspuns:
[tex] \frac{2}{4} \times a = \frac{b}{3} \\ a = \frac{b}{3} \div \frac{2}{4} \\ a = \frac{b}{3} \times \frac{4}{2} = \frac{4b}{6} \\ a + b = 80 \\ \frac{4b}{6} + b = 80 \\ \frac{4b}{6} + \frac{6b}{6} = \frac{480}{6} \\ 4b + 6b = 480 \\ 10b = 480 \\ b = 48 \\ a = \frac{4b}{6} = \frac{4 \times 48}{6} = 4 \times 8 = 32[/tex]
