# Math Help - Please help!! precents

1. ## Please help!! precents

Can somene please help with the following question:

2. Originally Posted by technics
Can somene please help with the following question:

$S=220-A$

Therefore: $S=220-50$

Finally: $S=170$

3. why 220 - 50?

4. Originally Posted by technics
why 220 - 50?
look at the dark grey box beneath the picture.

If you would like to see another way, then please ask.

5. Originally Posted by technics
Can somene please help with the following question:

As the standard maximul heart rate +10% is 187 and the standard maximul heart rate -10% is 153, the standard maximul heart rate is:

(187+153)/2=170

RonL

6. Originally Posted by CaptainBlack
As the standard maximul heart rate +10% is 187 and the standard maximul heart rate -10% is 153, the standard maximul heart rate is:

(187+153)/2=120

RonL
So, 120 minus 10% is 153? For once it's not me who made the mistake

7. Originally Posted by Quick
So, 120 minus 10% is 153? For once it's not me who made the mistake
You were too QUICK replying I posted then checked, you replyed while I was doing the checking.

RonL

8. what does 220 represent?

9. It's just a number.

10. Originally Posted by technics
what does 220 represent?
It is part of the model of standard maximum heart rate as a function of age.

standard maximum heart rate = 220 - age

RonL