Odpowiedź :
[tex]1,5 \ kg \ --- \ 7,5 \ zl\\1 \ kg \ \ \ \ \---- \ \ x \ zl\\\\x = \frac{1 \ kg\cdot7,5 \ zl}{1,5 \ kg} =5,00 \ zl\\\\cena \ za \ 1 \ kg \ \boxed{5,00} \ zl[/tex]
[tex]1,5 \ kg \ --- \ 7,5 \ zl\\1 \ kg \ \ \ \ \---- \ \ x \ zl\\\\x = \frac{1 \ kg\cdot7,5 \ zl}{1,5 \ kg} =5,00 \ zl\\\\cena \ za \ 1 \ kg \ \boxed{5,00} \ zl[/tex]