[tex] \frac{x}{100} \times 40 = 20[/tex]
[tex] \frac{x}{10} \times 4 = 20[/tex]
[tex] \frac{x}{5} \times 2 = 20[/tex]
[tex] \frac{2x}{5} = 20[/tex]
[tex]2x = 5 \times 20[/tex]
[tex]2x = 100[/tex]
[tex]x = \frac{100}{2} [/tex]
[tex]x = 50 \: \%[/tex]
[tex] \frac{x}{100} \times 50 = 20[/tex]
[tex] \frac{x}{10} \times 5 = 20[/tex]
[tex] \frac{x}{2} = 20[/tex]
[tex]x = 2 \times 20[/tex]
[tex]x = 40 \: \%[/tex]
[tex] \frac{x}{100} \times 80 = 20[/tex]
[tex] \frac{x}{10} \times 8 = 20[/tex]
[tex] \frac{x}{5} \times 4 = 20[/tex]
[tex] \frac{4x}{5} = 20[/tex]
[tex]4x = 5 \times 20[/tex]
[tex]4x = 100[/tex]
[tex]x = \frac{100}{4} [/tex]
[tex]x = 25 \: \%[/tex]
[tex] \frac{x}{100} \times 100 = 20[/tex]
[tex]x = 20 \: \%[/tex]
[tex] \frac{x}{100} \times 200 = 20[/tex]
[tex]2x = 20[/tex]
[tex]x = \frac{20}{2} [/tex]
[tex]x = 10 \: \%[/tex]
[tex] \frac{x}{100} \times 250 = 20[/tex]
[tex] \frac{x}{10} \times 25 = 20[/tex]
[tex] \frac{x}{2} \times 5 = 20[/tex]
[tex] \frac{5x}{2} = 20[/tex]
[tex]5x = 2 \times 20[/tex]
[tex]5x = 40[/tex]
[tex]x = \frac{40}{5} [/tex]
[tex]x = 8 \: \%[/tex]
[tex] \frac{x}{100} \times 400 = 20[/tex]
[tex]4x = 20[/tex]
[tex]x = \frac{20}{4} [/tex]
[tex]x = 5 \: \%[/tex]
[tex] \frac{x}{100} \times 10 = 20[/tex]
[tex] \frac{x}{10} = 20[/tex]
[tex]x = 10 \times 20[/tex]
[tex]x = 200 \: \%[/tex]
