Chapter 5 - Ratio and Proportion - 5.4 Solving Problems - 5.4 Exercises - Page 357: 25

$x = 0.2$ $x = \frac{1}{5}$

$\frac{0.5}{x} = \frac{2}{0.8}$ $2x = (0.5)(0.8)$ $2x = 0.4$ $2x\div2 = 0.4\div2$ $x = 0.2$ $\frac{\frac{1}{2}}{x} = \frac{2}{\frac{8}{10}}$ $2x = (\frac{1}{2})(\frac{8}{10})$ $2x = \frac{8}{20}$ $2x(\frac{1}{2}) = \frac{8}{20}(\frac{1}{2})$ $x = \frac{8}{40}$ $x = \frac{8\div8}{40\div8}$ $x = \frac{1}{5}$