Question

I need help on number 5 please , I don't know how to figure it out .....

Answer 1

so, if we take 685 to be the 100%, what is 20.55 in percentage off of it?

well
`\bf \begin{array}{ccllll} amount&\%\\ \textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\ 685&100\\ 20.55&x \end{array}\implies \cfrac{685}{20.55}=\cfrac{100}{x}`

solve for "x"