Răspuns:
[tex] \frac{x}{12} = \frac{5}{4} \\ \\ 4x = 60 \\ x = 60 \div 4 \\ x = 15 \\ ................ \\ \frac{6}{x} = \frac{24}{18} \\ \\ \frac{6}{x} = \frac{24 \div 6}{18 \div 6} = > \frac{6}{x} = \frac{4}{3} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = > 4x = 18 \\ \: \: \: \: \: \: = > x = \frac{9}{2} = > x = 4.5[/tex]
