4 quarts of blood are equivalent to 128 pounds.
To find how many pounds are equivalent to 5 quarts, we can use the next proportion:
[tex]\frac{4\text{ quarts of blood}}{5\text{ quarts of blood}}=\frac{128\text{ pounds}}{x\text{ pounds}}[/tex]Solving for x:
[tex]\begin{gathered} 4\cdot x=128\cdot5 \\ x=\frac{640}{4} \\ x=160\text{ pounds} \end{gathered}[/tex]