If 8a = 9b then the ratio of a9 to b8 is

Answer: Option A

$$\begin{array}{rl}& =\text{8a}=\text{9b}\Rightarrow a=\frac{9}{8}b\\ & \therefore \frac{\text{a}}{\text{9}}:\frac{\text{b}}{\text{8}}=\frac{\left(\frac{9}{8}b\right)}{9}:\frac{\text{b}}{\text{8}}\\ & =\frac{\text{b}}{\text{8}}:\frac{\text{b}}{\text{8}}=1:1\end{array}$$