Răspuns:
[tex]a + b + c = 78 \\ b - 24 = \frac{a}{4} = > b = \frac{a}{4} + 24 \\ c = a \\ a + \frac{a}{4} + 24 + a = 78 \\ \frac{4a}{4} + \frac{a}{4} + \frac{96}{4} + \frac{4a}{4} = \frac{312}{4} | \times 4 \\ 9a + 96 = 312 \\ 9a = 216 \\ a = 24 \\ c = 24 \\ b = \frac{24}{4} + 24 \\ b = 6 + 24 \\ b = 30 \\ v. \: 24 + 24 + 30 = 78[/tex]