Răspuns: x = 2
[tex]\it \dfrac{1}{8}=\dfrac{x+3}{40} \Rightarrow8\cdot x+8\cdot3=40\cdot1 \Rightarrow\\\\\\ 8x+24=40\Rightarrow8x=40-24\Rightarrow8x=16\Rightarrow x=\dfrac{16}{8} = \boxed{\it x = 2} \\\\\\ \text{\it Produsul mezilor este egal cu produsul extremilor}[/tex]
