13 per 2 dikurang 18 per 5 =

13/2-18/5=65/10-36/10=29/10=2 9 per 20

[tex] \frac{13}{2} - \frac{18}{5} = \frac{65}{10} - \frac{36}{10} = \frac{29}{10} = 2 \frac{9}{10} [/tex]