Question

Suppose that an individual has a body fat percentage of
18.3%
and weighs
188
pounds. How many pounds of her weight is made up of fat? Round your answer to the nearest tenth

Answer 1

namely, how much is 18.3% from 188? well if we take 188 to be 100%, then

$\bf \begin{array}{ccllll} amount&\%\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 188&100\\ x&18.3 \end{array}\implies \cfrac{188}{x}=\cfrac{100}{18.3}\implies \cfrac{188\cdot 18.3}{100}=x$