A class of 25 students is making necklaces. The necklaces each have 30 beads. How many beads are needed for each student to make one necklace?

g. \( \left(-\frac{16}{27}\right)-\left(-\frac{4}{9}\right) \)

11. \( \left(1+\frac{1}{2}\right) \cdot\left(1+\frac{2}{3}\right) \cdot\left(1+\frac{3}{4}\right) \) Yukarıda verilen işlemin sonucu kaçıır? \( \begin{array}{llll}\text { A) } \frac{3}{4} & \text { B) } \frac{7}{2} & \text { C) } \frac{2 k}{8} & \text { D) } \frac{35}{8}\end{array} \)

\( \frac{\frac{5}{3}}{1 \frac{4}{11}} \) Yukarıda verilen işlemin sonucu kaçuır? \begin{tabular}{llll|l} A) \( \frac{11}{9} \) & B) \( \frac{5}{9} \) & C) \( \frac{9}{11} \) & D) \( \frac{9}{5} \)\end{tabular}

\begin{tabular}{l} ¿Cuál es el par de números que representa una analogía numérica similar a la siguiente? \\ \hline \( 9: 81 \) \\ \hline \( 7: 350 \) \\ \hline \( 17: 289 \) \\ \( 8: 16 \) \\ \( 13: 187 \) \\ \( 9: 90 \) \\ \hline\end{tabular}

12. \( \frac{6}{\frac{2}{5}}-\frac{\frac{6}{2}}{5} \) Yukanda verilen işlemin sonucu kaçtır? \( \begin{array}{llll}\text { A) } \frac{72}{5} & \text { B) } \frac{-72}{5} & \text { C) } \frac{5}{72} & \text { D) } \frac{-5}{72}\end{array} \)