Answer
Find out the 12 is 90% of what number .
To prove
Percentage Formula
[tex]Percentage = \frac{Part\ value\times100}{Total\value}[/tex]
As given
3 is 12%
Percentage = 12%
Part value = 3
Put the value in the Percentage formula
[tex]12= \frac{3\times100}{Total\ value}[/tex]
[tex]Total\ value = \frac{300}{12}[/tex]
Total value = 25
Therefore 3 is 12% of number 25 .