Răspuns:
B=70-a
A/70-a=6/8
8a=6(70-a)
8a=420-6a
14a=420
A=30
B=70-30
B=50
[tex]\it \dfrac{a}{b}=\dfrac{6}{8} \Rightarrow \dfrac{a}{6}=\dfrac{b}{8} = \dfrac{a+b}{6+8}=\dfrac{70}{14}=5\Rightarrow \begin{cases}\it \dfrac{a}{6}=5 \Rightarrow a=6\cdot5=30\\ \\ \it \dfrac{b}{8}=5 \Rightarrow b=8\cdot5=40\end{cases}[/tex]
