Doctors use the term maximum heart rate (MHR) when referring to the quantity found by
starting with 220 beats per minute and subtracting 1 beat per minute for each year of a
person’s age. Doctors recommend exercising 3 or 4 times each week for at least 20 minutes
with your heart rate increased from its resting heart rate (RHR) to its training heart rate
(THR), where THR = RHR + .65(MHR – RHR)
Which of the following is closest to the THR of a 43-year-old person whose RHR is 54 beats
per minute?
A. 197
B. 169
C. 162
D. 134
E. 80

Question

Doctors use the term maximum heart rate (MHR) when referring to the quantity found by 
starting with 220 beats per minute and subtracting 1 beat per minute for each year of a 
person’s age. Doctors recommend exercising 3 or 4 times each week for at least 20 minutes 
with your heart rate increased from its resting heart rate (RHR) to its training heart rate 
(THR), where             THR = RHR + .65(MHR – RHR)   
 Which of the following is closest to the THR of a 43-year-old person whose RHR is 54 beats 
per minute?  
A.  197  
B.  169  
C.  162  
D.  134  
E.     80

anonymous · Answer

first find the MHR which is given to you as 220 - age
age = 43 
so 220 - 43 = 177
MHR = 177
the RHR is given as 54

now substitute

THR = 54 + .65(177 - 54)

punch those into a scientific calculator

youll get 133.95

it says clostest so round off youll get 134 so ans is D