a) \[ \frac{\frac{8}{15}}{\frac{4}{9}} = \]
b) \[ \frac{\frac{21}{28}}{\frac{7}{8}} = \]
c) \[ \frac{\frac{18}{25}}{\frac{9}{10}} = \]
d) \[ \frac{\frac{14}{35}}{\frac{7}{25}} = \]
e) \[ \frac{\frac{12}{30}}{\frac{9}{15}} = \]
f) \[ \frac{\frac{10}{27}}{\frac{5}{9}} = \]
