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Fish Math III: The Ultimate Water Change :-)
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Which water change routine will keep his nitrate below 40 ppm?
I have no idea how to solve this
14%
 14%  [ 7 ]
10% every week
2%
 2%  [ 1 ]
20% every week
47%
 47%  [ 23 ]
25% every 2 weeks
16%
 16%  [ 8 ]
30% every 2 weeks
12%
 12%  [ 6 ]
35% every month
2%
 2%  [ 1 ]
40% every month
4%
 4%  [ 2 ]
Total Votes : 48

Author Message
Dawn
Benefactors


Joined: 05 Feb 2003
Location: Raisinville, MI, USA

PostPosted: 2003.08.18(Mon)13:19    Post subject: Reply with quote

I knew 40% was wrong after I voted, but you can't change your vote. If you want to figure it by days in the month it's usually 4.33 (if I remember that right). See what happens when you're too lazy to actually write things down. Rolling Eyes
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Cyradia
Benefactors


Joined: 06 Feb 2003
Location: Winston-Salem, NC

PostPosted: 2003.08.18(Mon)13:30    Post subject: Reply with quote

Yeah, and after all of my math, I ended up punching in the wrong vote. I used a spreadsheet to check my math, and the way I set them up was a column of what you're taking out, and then a column of what's in the tank. I actually voted for the 35% because that number was approaching 40...but I had looked at the column which was how much nitrate are you taking out instead of how much is in the tank. As soon as I hit the vote I realized my mistake and knew it was 25%, but you can't change your vote.

Blast it all...doing the math right and being outsmarted by the html buttons!
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nonamethefish
Moderators


Joined: 06 Feb 2003

PostPosted: 2004.04.13(Tue)21:53    Post subject: Reply with quote

So you mean this math stuff comes back to get you?
*groan*
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Marcos Avila
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Joined: 05 Feb 2003
Location: Santo Andre (Brazil)

PostPosted: 2004.04.13(Tue)23:07    Post subject: Reply with quote

Noname, are you alright? Any particular reason why you added that little comment to a topic that's almost 1 year old? Wink
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Success with a fish/tank is measured in YEARS, not months or weeks...
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Kunnagh
Regulars


Joined: 28 Jul 2003
Location: Bristol, UK

PostPosted: 2004.04.14(Wed)6:33    Post subject: Reply with quote

Quote:
Noname, are you alright? Any particular reason why you added that little comment to a topic that's almost 1 year old?


A great addition to a maths poll thread! After discussion about whether 25%, 30% or 20% of water being changed, and 25% being considered correct and none of the others, Professor Avila, who sets these devilish problems, declares that 65% of a year is 'nearly a year'. Shocked We should all expect well over 30% leeway in any answers we submit for marking from here on in! Laughing Wink

Meanwhile, I've just started reading this book and so might feel confident to actually post a sensible reply next time!

Cheers!
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nonamethefish
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Joined: 06 Feb 2003

PostPosted: 2004.04.24(Sat)12:38    Post subject: Reply with quote

Well, it was only on page 2 Embarassed

It looks like good article material...maybe make it so normal people can understand it though! LOL
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