# 80% of what number is 12?

The answer is $15$.
$12 = \setminus \frac{80}{100} x$
$\setminus \implies 12 = \setminus \frac{4}{5} x$
$\setminus \implies x = \frac{12}{\frac{4}{5}} = \frac{12 \cdot 5}{4} = \frac{60}{4} = 15$