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The volume of air in a persons lungs is 615 mL at a pressure of 760 mmHG inhalation occures at the pressure in the lungs drops to 752 mmHG, to wha volume did the lungs expand

I got 615*760=V2*752=621 i keep getting 621 and the answer is 620 what i'am i doing wrong

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3 sig figs

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