Question 214434
In order to achieve maximum results from aerobic exercise, one should maintain one’s heart rate at a certain level. A 30-year-old woman with a resting heart rate of 60 beats per minute should keep her heart rate between 138 and 162 beats per minute while exercising. She checks her pulse for 10 sec while exercising. What should the number of beats be? 
This should be in the form of an inequality. 
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10 sec is (1/6)th of a minute
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(1/6)138 = 23
(1/6)162 = 27
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Let her pulse count for the 10 seconds be "x".
Ans. to your problem: 23 < x < 27
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Cheers,
Stan H.