## Thinking Mathematically (6th Edition)

Consider the proportional relation between the weight of the body and the volume of blood in a person’s body. Because, the person with 160 pounds weight has 5 quarts of blood. So, the person with 1 pounds weight will have $\frac{5}{160}\ \text{quarts}$of blood. This shows that the person with 200 pounds weight has $\left( \frac{5}{160}\times 200 \right)\ \text{quarts}$ of blood. It is solved as, \begin{align} & V=\frac{5}{160}\times 200 \\ & =6.25\ \text{quarts} \end{align} Hence, the number of quarts of blood in a person who weighs 200 pounds is 6.25 quarts.