K) $$1,32:3\frac{1}{7}=y:\frac{25}{42}$$

Решим пропорцию:

1. $$1,32:3\frac{1}{7}=y:\frac{25}{42}$$$$1,32:\frac{22}{7}=y:\frac{25}{42}$$$$y=\frac{1,32\cdot\frac{25}{42}}{\frac{22}{7}}$$$$y=\frac{1,32\cdot25\cdot7}{42\cdot22}$$$$y=\frac{1,32\cdot25\cdot7}{6\cdot7\cdot22}$$$$y=\frac{1,32\cdot25}{6\cdot22}$$$$y=\frac{33\cdot25}{150\cdot22}$$$$y=\frac{3\cdot5}{30\cdot2}$$$$y=\frac{1\cdot1}{2\cdot2}$$$$y=\frac{1}{4}=0,25$$

Ответ: y = 0.25