$a)$  

$\frac{2}{3}\text{ kwoty }60\text{zł}\text{ to }$  

$\frac{2}{3}\cdot 60\text{zł}=$  

$=\frac{2}{\underset{1}{\cancel{3}}\cdot \stackrel{20}{\cancel{60}}\text{zł}=}$  

$=2\cdot 20\text{zł}=$  

$=40\text{zł}$  

 

$b)$  

$\frac{7}{10}\text{ kwoty }200\text{zł}\text{ to }$  

$\frac{7}{10}\cdot 200\text{zł}=$  

$=\frac{7}{\underset{1}{\cancel{10}}}\cdot \stackrel{20}{\cancel{200}}\text{zł}=$  

$=7\cdot 20\text{zł}=$  

$=140\text{zł}$  

 

$c)$  

$\frac{3}{4}\text{ masy }120\text{kg}\text{ to }$  

$\frac{3}{4}\cdot 120\text{kg}=$  

$=\frac{3}{\underset{1}{\cancel{4}}}\cdot \stackrel{30}{\cancel{120}}\text{kg}=$  

$=3\cdot 30\text{kg}=$  

$=90\text{kg}$  

 

$d)$  

$\frac{5}{9}\text{ liczby }18\text{ to }$  

$\frac{5}{9}\cdot 18=$  

$\frac{5}{\underset{1}{\sout{9}}}\cdot \stackrel{2}{\sout{18}}=$  

$=5\cdot 2=$  

$=10$  

 

$e)$  

$\frac{4}{7}\text{ liczby }210\text{ to }$  

$\frac{4}{7}\cdot 210=$  

$=\frac{4}{\underset{1}{\sout{7}}}\cdot \stackrel{30}{\sout{210}}=$  

$=4\cdot 30=$  

$=120$  

 

$f)$  

$2\frac{2}{3}\text{ liczby }90\text{ to }$  

$2\frac{2}{3}\cdot 90=$  

$=\frac{2\cdot 3+2}{3}\cdot 90=$  

$=\frac{6+2}{3}\cdot 90=$  

$=\frac{8}{3}\cdot 90=$  

$=\frac{8}{\underset{1}{\sout{3}}}\cdot \stackrel{30}{\sout{90}}=$  

$=8\cdot 30=$  

$=240$  

 

$g)$  

$\frac{5}{6}\text{ długosˊci }42\text{km}\text{ to }$  

$\frac{5}{6}\cdot 42\text{km}=$  

$\frac{5}{\underset{1}{\sout{6}}}\cdot \stackrel{7}{\sout{42}}\text{km}=$  

$=5\cdot 7\text{km}=$  

$=35\text{km}$  

 

$h)$  

$\frac{4}{5}\text{ objętosˊci }3,5\text{litra}\text{ to }$  

$\frac{4}{5}\cdot 3,5\text{l}=$  

$=\frac{4}{5}\cdot 3\frac{5}{10}\text{l}=$  

$=\frac{4}{5}\cdot \frac{3\cdot 10+5}{10}\text{l}=$  

$=\frac{4}{5}\cdot \frac{30+5}{10}\text{l}=$  

$=\frac{4}{5}\cdot \frac{35}{10}\text{l}=$  

$=\frac{\stackrel{2}{\cancel{4}}}{\underset{1}{\sout{5}}}\cdot \frac{\stackrel{7}{\sout{35}}}{\underset{5}{\cancel{10}}}\text{l}=$  

$=\frac{2}{1}\cdot \frac{7}{5}=$  

$=\frac{2\cdot 7}{1\cdot 5}=$  

$=\frac{14}{5}=$  

$=\frac{{14}^{\cdot 2}}{5_{\cdot 2}}=$  

$=\frac{28}{10}=$  

$=2,8$  

 

$i)$  

$\frac{5}{6}\text{ czasu }2\frac{3}{5}\text{godziny}\text{ to }$  

$\frac{5}{6}\cdot 2\frac{3}{5}\text{godziny}=$  

$=\frac{5}{6}\cdot \frac{2\cdot 5+3}{5}\text{godziny}=$  

$=\frac{5}{6}\cdot \frac{10+3}{5}\text{godziny}=$  

$=\frac{5}{6}\cdot \frac{13}{5}\text{godziny}=$  

$=\frac{\stackrel{1}{\sout{5}}}{6}\cdot \frac{13}{\underset{1}{\sout{5}}}\text{godziny}=$  

$=\frac{1}{6}\cdot \frac{13}{1}\text{godziny}=$  

$=\frac{13}{6}\text{godziny}=$  

$=\frac{{13}^{\cdot 10}}{6_{\cdot 10}}\text{godziny}=$  

$=\frac{130}{60}\text{godziny}=$  

$=130\cdot \frac{1}{60}\text{godziny}=$  

$=130\text{min}$