3/4 : 1/2 :: 27y : ? Solve this -

Answer: Option B

Let the missing number be x.
Then,
$$\begin{array}{rl}& =\frac{1}{3}:\frac{1}{2}::27y:x\\ & \Rightarrow \frac{3}{4}x=\frac{1}{2}\times \text{27}y\\ & \Rightarrow x\text{ = }\frac{27y}{2}\times \frac{4}{3}\\ & =18y\end{array}$$