14 21 25 50

\[ \frac{14}{25} \div \frac{21}{50} = \frac{14}{25} \cdot \frac{50}{21} = \frac{14 \cdot 50}{25 \cdot 21} = \frac{700}{525} = \frac{4}{3} = 1\frac{1}{3} \]

Ответ: \(1\frac{1}{3}\)