Question

medicine is administered at a rate of 6.5 mg per kilograms of body weight. how much should be administered to a child who weighs 50 kilograms?

Answer 1

$\bf \begin{array}{ccll} \stackrel{mg}{medicine}&\stackrel{kg}{weight}\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 6.5&1\\ x&50 \end{array}\implies \cfrac{6.5}{x}=\cfrac{1}{50}\implies \cfrac{6.5\cdot 50}{1}=x\implies 325=x$