Answer:
Explanation:
Given parameters:
Number of breathe per minute = 15times
Volume of air per breath = 0.5L
Percentage of oxygen in air = 21%
Solution
There are 24 hours in a day.
 60minutes makes a hour in a day,
I will breathe:
      15 times x 60 x 24  = 21600 times in a day
The volume of air I will take in per day:
    A breathe = 0.5L of air
  21600breathe = 0.5 x 21600 = 10800L of air
Volume of oxygen I will breathe per day:
  [tex]\frac{21}{100}[/tex] x 10800 = 2268L of oxygen