[tex]a)\\\frac{x}{22}=\frac{27}{22+11}\\\\\frac{x}{22}=\frac{27}{33}\\\\\frac{x}{22}=\frac{9}{11}\\\\11x=22\cdot9\ \ \ |:11\\\\x=2\cdot9\\\\x=18[/tex]
[tex]b)\\\frac{x}{2}=\frac{5}{4}\\\\4x=2\cdot5\\\\4x=10\ \ \ |:4\\\\x=2,5[/tex]
