Question

What percent of 28 is 21

Answer 1

If we take 28 to be the 100%, what  is 21 off of it?

$\bf \begin{array}{ccll} amount&\%\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 28&100\\ 21&p \end{array}\implies \cfrac{28}{21}=\cfrac{100}{p}\implies p=\cfrac{21\cdot 100}{28}$

Answer 2

21 divided by 28 equals 7. thus is 70%