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dariohage20121
well dude it depends of many facts, for example, if you are doing sport it's obvious that you traget heart will growth but talking into account a normal person with 15 years, it will be probably a low target but it depends of the effort he doing or more aspects. I hope I help (if I have bad my spelling grammar is because I am a 15 year old spanish guy xd)
Erudite1
The maximum heart rate is calculated by removing the given age from 220. In this case, we are given 15 as the value for age. So, we have: 220 15 = 205.
To calculate the heart rate range, we have to calculate for three zones:
Zone 1= Maximum heart range * 0.6 = 205 * 0.6 = 123.
Zone 2 = Maximum heart range * 0.7 = 205 * 0.7 = 143.5.
Zone 3 = Maximum heart range * 0.8 = 205 * 0.8 = 164.
Therefore, the heart rate range = 123 - 164.
Thus, the correct option is B.

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