In this question, we have to estimate the number of breaths taken by a human being during an average life time .
And average respiratory rate of about 10 breaths per minute . And average age of a human being is 70 years .
In 1 minute, number of breaths are 10 breaths .
So in 1 day,number of breaths are
[tex]= 10*60*24 breaths = 14400 breaths[/tex]
And for one year, it is
[tex]=14400*365 =5256000 breaths[/tex]
And in 7 years, it is
[tex]= 5256000*7 =36792000 breaths[/tex]