[tex]\it \{15,\ 10,\ 30\}\ d.\ p.\ \{x,\ y,\ 18\} \Rightarrow \dfrac{15}{x} =\dfrac{10}{y} =\dfrac{30}{18}
\\ \\ \\
\dfrac{15}{x} =\dfrac{30}{18} \Rightarrow x=\dfrac{15\cdot18}{30} =9
\\ \\ \\
\dfrac{10}{y} =\dfrac{30}{18} \Rightarrow y=\dfrac{10\cdot18}{30} =6[/tex]
