[tex]1) \: \frac{1}{2} \times \frac{2}{3} + \frac{8}{3}[/tex]
[tex] = \frac{2}{6} + \frac{8}{3} [/tex]
[tex] = \frac{1}{3} + \frac{8}{3} [/tex]
[tex] = \frac{9}{3} = 3[/tex]
[tex] \\ [/tex]
[tex]2) \: x = 20 \\ x - \frac{x \times 10}{100} = [/tex]
[tex] = x - \frac{x}{10} [/tex]
[tex] = \frac{10 \times x}{10} - \frac{x}{10} [/tex]
[tex] = \frac{9 \times x}{10} [/tex]
[tex] = \frac{9 \times 20}{10} [/tex]
[tex] = 9 \times 2 = 18[/tex]
