Răspuns:
[tex] \frac{a}{2} = \frac{b}{3} = k \\ a = 2k \\ b = 3k \\ 4k + 9k = \frac{13}{2} \\ 8k + 18k = 13 \\ 26k = 13 \\ k = 0.5 \\ a = 1 \\ b = 1.5[/tex]
