Question

25 supra 100 *  x = 3

Answer 1

0.25*x=3
x=3:0.25=12
x=12

Answer 2

$\displaystyle \frac{25}{100} \cdot x=3 \\ \frac{25x}{100} =3 \\ 25x=3 \cdot 100 \\ 25x=300 \\ x= \frac{300}{25} \\ x=12$