$a)$

$3\%=0,03$

$0,03\cdot x=4$

$x=4:0,03=133\frac{1}{3}m$

 

 

$b)$

$25\%=\frac{25}{100}=\frac{1}{4}$

$\frac{1}{4}\cdot x=160$

$x=160\cdot 4=640\text{zł}$

 

 

$c)$

$60\%=\frac{60}{100}=\frac{3}{5}$

$\frac{3}{5}\cdot x=180$

$x={\sout{180}}^{60}\cdot \frac{5}{{\sout{3}}^1}=300\text{dag}$

 

 

$d)$

$5\%=\frac{5}{100}=\frac{1}{20}$

$\frac{1}{20}\cdot x=21,2$

$x=21,2\cdot 20=424m^2$

 

 

 

$e)$

$33\frac{1}{3}\%=\frac{100}{3}\%=\frac{100}{3}\cdot \frac{1}{100}=\frac{1}{3}$

$\frac{1}{3}\cdot x=27,3$

$x=27,3\cdot 3=81,9ha$

 

 

$f)$

$66\frac{2}{3}\%=\frac{200}{3}\%=\frac{200}{3}\cdot \frac{1}{100}=\frac{2}{3}$

$\frac{2}{3}\cdot x=146,2$

$x=146,2\cdot \frac{3}{2}=219,3g$

 

 

$g)$

$14\frac{2}{7}\%=\frac{100}{7}\%=\frac{100}{7}\cdot \frac{1}{100}=\frac{1}{7}$

$\frac{1}{7}\cdot x=6\frac{3}{4}$

$x=6\frac{3}{4}\cdot 7=42\frac{21}{4}=42+5\frac{1}{4}=47\frac{1}{4}ml$

 

 

$h)$

$13\%=0,13$

$0,13\cdot x=130$

$x=130:0,13=13000:13=1000$

 

 

$i)$

$48\%=0,48$

$0,48\cdot x=94,08$

$x=94,08:0,48=196\text{zł}$