Answer
The lungs expand to 622 mL.
Work Step by Step
According to the Boyle's Law:
$$P_1V_1 = P_2V_2 \longrightarrow \frac{P_1V_1}{P_2} = V_2$$
$$V_2 = \frac{(760. \space mmHg)(615 \space mL)}{752 \space mmHg} = 622 \space mL$$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.