Question

If it rained on 3 days out of 20 days , on what percent of the says dis it rain?

Answer 1

3 day divided by 20 days is .15 which is 15%

Answer 2

If we take 20 to be the 100%, what is 3 off of it?

$\bf \begin{array}{ccll} amount&\%\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 20&100\\ 3&p \end{array}\implies \cfrac{20}{3}=\cfrac{100}{p}\implies p=\cfrac{3\cdot 100}{20}$