Final answer:
A 120-pound person has approximately 4 quarts of blood in their body.
Step-by-step explanation:
To find the approximate number of quarts of blood in a person's body, we can use the expression (w)/(30), where w is the person's weight in pounds. So, for a 120-pound person, we can substitute w = 120 into the expression and calculate:
(120)/(30) = 4 quarts
Therefore, a 120-pound person has approximately 4 quarts of blood.