Question

9 is 12% of which number

Answer 1

9 is 12% of say "x"

that means that "x" is 100% or the full amount
so \(\large \begin{array}{ccllll}
amount&\%
\\\hline\\
x&100\\
9&12
\end{array}\implies \cfrac{x}{9}=\cfrac{100}{12}\) solve for "x"

Answer 2

75.