~\par\vspace{-3em}
\begin{multicols}{2}
\begin{questions}
\item $\begin{aligned}[t]
A & = \frac{5^3\times 8^3\times 9^2}{15^2\times 12^4}\\
&= \frac{5^3\times 2^9 \times 3^4}{3^2\times 5^2\times 3^4 \times 2^8}\\
&= \frac{5\times 2}{3^2}\\
&= 5\times 3^{-2}\times 2.
\end{aligned}$

\item $\begin{aligned}[t]
B&=\frac{12^3\times 15^{-3}}{5^{-2}\times 2^3}\\
& =\frac{12^3\times5^2}{15^3\times 2^3}\\                                                            &= \frac{2^6\times 3^3\times 5^2}{5^3\times 3^3\times 2^3}\\
&= \frac{2^3}{5} \\
&= 2^3\times 5^{-1}.
\end{aligned}$
\end{questions}
\end{multicols}

