Question

9 is 12% of which number

Answer 1

say number "x"
which is 100% or the whole amount

but we also know that 9 is 12% of that
so we could say that \(\large \begin{array}{ccllll}
amount&\%
\\\hline\\
x&100\\
9&12
\end{array}\implies \cfrac{x}{9}=\cfrac{100}{12}\)

Answer 2

9 is 12% of 75.