Devon's target heart rate zone is 140bpm—177bpm. Julian's target heart rate zone is 148bpm—181bpm. They stop running and take their pulse, and both count the heart rate at 173bpm. If they decrease their heart rates by 20bpm, who will be in his THR zone?
Both Devon and Julian
Neither Devon nor Julian
Devon only
Julian only

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what is 173 - 20?
where is this on each scale ?

I really have no idea..

no idea what is 173 - 20?
no idea how to place numbers on a number line?
or no idea how to try?

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