[tex]a,b-nr.[/tex]
[tex]a + b = 3.72[/tex]
[tex]a = \frac{1}{3} \times b + 0.6[/tex]
[tex]a = \frac{b}{3} + 0.6[/tex]
[tex] \frac{b}{3} + 0.6 + b = 3.72 \: | \times 3[/tex]
[tex]b + 1.8 + 3b = 11.16[/tex]
[tex]b + 3b = 11.16 - 1.8[/tex]
[tex]4b = 9.36[/tex]
[tex]b = \frac{9.36}{4} [/tex]
[tex]b = 2.34[/tex]
[tex]a = \frac{b}{3} + 0.6[/tex]
[tex]a = \frac{2.34}{3} + 0.6[/tex]
[tex]a = 0.78 + 0.6[/tex]
[tex]a = 1.38[/tex]