Find the value of 309 ÷ [ ( 3/2 ) of ( 25 + 35 ) - 123/4 ]

Answer: Option D

$$\begin{array}{rl}& 309÷\left[\left(\frac{3}{2}\right)\text{of}\left(25+35\right)-12\frac{3}{4}\right]\\ & =309÷\left[\frac{3}{2}\times 60-\frac{51}{4}\right]\\ & =309÷\left[90-\frac{51}{4}\right]\\ & =309\times \frac{4}{360-51}\\ & =4\end{array}$$