[tex] \frac{x}{y} = 8[/tex]
[tex]a) \frac{x}{3y} = \frac{1}{3} \times \frac{x}{y} = \frac{1}{3} \times 8 = \frac{8}{3} [/tex]
[tex]b) \frac{4x}{y} = 4 \times \frac{x}{y} = 4 \times 8 = 32[/tex]
[tex]c) \frac{5x}{8y} = \frac{5}{8} \times \frac{x}{y} = \frac{5}{8} \times 8 = 5[/tex]
[tex]d) \frac{0.2x}{y} = 0.2 \times \frac{x}{y} = \frac{2}{10} \times 8 = \frac{1}{5} \times 8 = \frac{8}{5} [/tex]
