Answer:
55.55 mL
Explanation:
Breathing is the process of inhaling air into and exhaling out of the lungs.
Total amount of oxygen required per minute = 240 mL
No. of breaths per minute = 12
Amount of oxygen required per minute
[tex]\frac{240}{12} =20mL[/tex]
One breath = 1 inhalation + 1 exhalation
Lets assume, volume of air per breath = [tex]x[/tex] mL
Volume of oxygen in inhaled air = 20%
Volume of oxygen in inhaled air = 16%
Total volume of oxygen during one breath = (20%)[tex]x[/tex] + (16%)[tex]x[/tex]
This implies,
[tex]\frac{20}{100}x+\frac{16}{100}x = 20 mL\\ 0.36x = 20 mL\\x = \frac{20}{0.36} mL\\ x = 55.55 mL[/tex]
Thus, volume of air per breath = 55.55 mL
