Mathematics - Basic maths Question with Solution | TestHub

If the value of $\frac{{\log }_{81}729+{\log }_{729}81}{\log \sqrt{\frac{9}{4}}\sqrt{\frac{81}{16}}+\log \sqrt{\frac{81}{16}}\sqrt{\frac{9}{4}}}=\frac{a}{b}$, then the value of $(b-a)$ is equal to, (where a \& b are coprime positive integers)