[tex]a) \frac{x}{3} = \frac{5}{1} => x = \frac{3*5}{1} => x = 15\\b) \frac{0,(3)}{x} = \frac{2}{0,(2)} => 2x = \frac{3}{9} * \frac{2}{9} => 2x = \frac{2}{27} => x = \frac{2}{54} = \frac{1}{27} \\c) \frac{x}{0,5} = \frac{1}{2} * \frac{1}{3} => 6x = 0,5 => 6x = \frac{1}{2} => x = \frac{1}{12} \\d) \frac{1}{8} = \frac{3}{2x} => 2x = 24 => x = 12[/tex]
