If x is the unknown number, then, you can write:
[tex]\frac{25}{100}x=12[/tex]The previous expression indicates that 25% of x is equal to 12. If you solve for x and simplify you obtain:
[tex]\begin{gathered} x=12*\frac{100}{25}=12*4=48 \\ x=48 \end{gathered}[/tex]Hence, 12 is 25% of 48
