Question : What is the value of $\frac{(55 + 88) [(3 \times 5 + 4)–64\div 8]}{28\times 7\div56\times 4 \text { of }(91–78)}$?

Question : What is the value of $\left[\frac{1}{5}+\left\{\frac{1}{6}\right.\right.$ of $\left.\left.\left(\frac{42}{35} \div \frac{6}{25}\right)–\left(\frac{2}{7} \times \frac{6}{5} \div \frac{18}{42}\right)\right\}+\frac{19}{30}\right]$?

Question : The value of $\frac{1}{8} × \left[\frac{1}{5}\right.$ of $\left.\frac{11}{2} ÷\left\{\left(\frac{15}{3}-\frac{18}{6}\right)\right\}\right]$ is:

Question : What is the value of $\frac{\left(\frac{28}{9} \times \frac{42}{35}\right) \div\left(\frac{3}{25} \times \frac{5}{7} \div \frac{1}{21}\right)}{\left(\frac{14}{15} \div \frac{2}{75} \text { of } \frac{7}{5}\right) \times \frac{1}{75} \div \frac{4}{3}} ?$

Question : What is the value of $\frac{91+13 \text { of }(45 ÷ 21 × 14 ÷ 5) - 22 × 4}{(42 × 21 ÷ 168 × 2) - (66 \text { of } 15 ÷ 90)}$?