SOLUTION: in order to achieve maximum results from aerobic exercise, one should maintain ones heart rate at a certain level. a 35 year old woman with a resting heart rate of 70 beats per min

Question 224788: in order to achieve maximum results from aerobic exercise, one should maintain ones heart rate at a certain level. a 35 year old woman with a resting heart rate of 70 beats per minut should keep her heart rate between 139 and 162 beats per minute while exercising she checks her pulse for 10 seconds while exercising what should the number of beats be?
the number of beats in 10 sec should be between___and ____beats.
Answer by LtAurora(115) (Show Source): You can put this solution on YOUR website!
We know that and .
So, our equation is for the 139 beats:

We can cross multiply this:

So, simplify:

Divide by 60:

Same procedure for 162 beats:

Now, if you are looking for whole beats that she needs to count, the answer would be between 24 and 27 beast in 10 seconds, since 23 beats would have her heart rate below 139, which is our minimum.
Since she can't count 23.167, this may be the answer they are looking for, but if you can use exact number then it's between 23.167 and 27...though even I would have a great deal of difficulty counting 23.167 beats.
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