Answer is: 15 milliliters of the solution.
m(acetaminophen) = 480.0 mg; mass of the solution.
c(acetaminophen) = 32.0 mg/mL; concentration of the solution.
V(acetaminophen) = m(acetaminophen) ÷ c(acetaminophen).
V(acetaminophen) = 480 mg ÷ 32 mg/mL.
V(acetaminophen) = 15 mL; volume of the solution.