According to the question, the average adult heart pumps about 84 mL/s of blood at 72 bpm. This can be expressed in equation form as:
84mL = 1 second ....................... 1
In order to calculate how long it would take the average heart to circulate 3400 mL of blood, this can be expressed as;
3400mL = x ..................................... 2
where;
x is the time it would take the average heart to circulate 3400 mL of blood.
Divide both equations 1 and 2 to set up the proportion equation;
[tex]\frac{84mL}{3400mL}=\frac{1\text{second}}{x}[/tex]Cross multiply the resulting proportion to get "x"
[tex]\begin{gathered} 84mL\times x=3400mL\times1\text{second} \\ x=\frac{3400mL\times1\text{second}}{84mL} \\ \text{Time}=\frac{3400mL\times1\text{second}}{84mL} \end{gathered}[/tex]Note that 72 beats per minute will not enter into the equation
