1. 27:x=9:11
$$x = \frac{27 \cdot 11}{9} = \frac{3 \cdot 11}{1} = 33$$
$$x = 33$$
2. 11:15=6x:30
$$6x = \frac{11 \cdot 30}{15} = 11 \cdot 2 = 22$$
$$x = \frac{22}{6} = \frac{11}{3}$$
Ответ: 1) x = 33; 2) $$x = \frac{11}{3}$$