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ijustdiedinside

Post subject: Math question Posted: Tue Jun 11, 2013 5:58 pm 

Chard Martyr 


Joined: Sun Sep 05, 2010 8:43 pm Posts: 9995 Location: Astoria, NY by way of San Diego, CA

Hey can some math person help me understand something...
I'm having trouble understanding the purpose of dividing by a decimal. Here's my real world dietitian example.
A patient has his entire leg amputated. A leg is 16% of a body (that's the standard percentage used). Sometimes we have to calculate adjusted body weight to determine how much someone would weigh if they were not missing a limb.
So the standard calculation for this is: Adjusted Body Weight = Current body weight/(10.16)
So we divide his weight by 0.84. In sort of mathy terms this means "how many 0.84s go into 150lb" (for example)
I get HOW to do the equation, I just don't get WHY this is the calculation for this.
(There's not really any good reason that I need to understand why. I think this is why i always had trouble with math as a kid. No one would explain the why, just the how)
_________________ I am not a troll. I am TELLING YOU THE ******GOD'S TRUTH****** AND YOU JUST DON'T WANT THE HEAR IT DO YOU?


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solipsistnation

Post subject: Re: Math question Posted: Tue Jun 11, 2013 6:14 pm 

Vegan Vegan Vegan Vegan Vegan 


Joined: Wed Oct 20, 2010 5:58 pm Posts: 4581 Location: Santa Cruz whoop whoop

0.84 is 84%, right?
You are trying to find out what 150lb is 84% of.
To find out what 84% of a number is, you multiply that number by 0.84.
In your example, you have a 150 pound person who is missing 16% of his body weight.
Let's get algebraic! Let X = total original body weight!
X * 0.84 = 150
Solve for X: divide both sides by 0.84:
(X * 0.84)/0.84 = 150 / 0.84
Simplify. The *0.84 and the /0.84 cancel out on the lefthand side:
X = 150/0.84.
Make sense?
(Edited for less repetition.)
_________________ "Trolling an internet message board, The Greatest Activism Of All."  pandacookie Вы такие сексапильные, когда злитесь


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ijustdiedinside

Post subject: Re: Math question Posted: Tue Jun 11, 2013 6:41 pm 

Chard Martyr 


Joined: Sun Sep 05, 2010 8:43 pm Posts: 9995 Location: Astoria, NY by way of San Diego, CA

solipsistnation wrote: 0.84 is 84%, right?
You are trying to find out what 150lb is 84% of.
To find out what 84% of a number is, you multiply that number by 0.84.
In your example, you have a 150 pound person who is missing 16% of his body weight.
Let's get algebraic! Let X = total original body weight!
X * 0.84 = 150
Solve for X: divide both sides by 0.84:
(X * 0.84)/0.84 = 150 / 0.84
Simplify. The *0.84 and the /0.84 cancel out on the lefthand side:
X = 150/0.84.
Make sense?
(Edited for less repetition.) Yes! THANK YOU! This is a perfect explanation. I really appreciate it!
_________________ I am not a troll. I am TELLING YOU THE ******GOD'S TRUTH****** AND YOU JUST DON'T WANT THE HEAR IT DO YOU?


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solipsistnation

Post subject: Re: Math question Posted: Tue Jun 11, 2013 7:16 pm 

Vegan Vegan Vegan Vegan Vegan 


Joined: Wed Oct 20, 2010 5:58 pm Posts: 4581 Location: Santa Cruz whoop whoop

Yay! I can still do math! 8)
_________________ "Trolling an internet message board, The Greatest Activism Of All."  pandacookie Вы такие сексапильные, когда злитесь


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Mars

Post subject: Re: Math question Posted: Wed Jun 12, 2013 12:11 am 

Plays The Sims 2 religiously 


Joined: Wed Oct 20, 2010 11:20 pm Posts: 6775 Location: Portland, OR

solipsistnation wrote: 0.84 is 84%, right?
You are trying to find out what 150lb is 84% of.
To find out what 84% of a number is, you multiply that number by 0.84.
In your example, you have a 150 pound person who is missing 16% of his body weight.
Let's get algebraic! Let X = total original body weight!
X * 0.84 = 150
Solve for X: divide both sides by 0.84:
(X * 0.84)/0.84 = 150 / 0.84
Simplify. The *0.84 and the /0.84 cancel out on the lefthand side:
X = 150/0.84.
Make sense?
(Edited for less repetition.) ISA!!!! ISA THERE'S MATH GOING ON IN YOUR FORUMS! MAKE IT STOP!
_________________ i would schmear marmite on a moist scrotum for Mars.  interrobang?! "Not everything." ~ mumbles (19732013)  mumbles


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kimba

Post subject: Re: Math question Posted: Wed Jun 12, 2013 6:58 am 

Has it on Blue Vinyl 


Joined: Wed Jan 05, 2011 7:44 pm Posts: 2102

No! We need more math. I was excited to answer a math question, but it was already done.


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Ariann

Post subject: Re: Math question Posted: Wed Jun 12, 2013 3:26 pm 

***LIES!!!*** 


Joined: Sun Feb 12, 2012 4:10 pm Posts: 3448

Kimba, I felt the same way!


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ijustdiedinside

Post subject: Re: Math question Posted: Wed Jun 12, 2013 3:28 pm 

Chard Martyr 


Joined: Sun Sep 05, 2010 8:43 pm Posts: 9995 Location: Astoria, NY by way of San Diego, CA

Thanks for trying to help guys! I'm sure I'll have more math questions for you someday.
or you know, if you just want me to give you sample tube feeding calculations, you have fun with those.
_________________ I am not a troll. I am TELLING YOU THE ******GOD'S TRUTH****** AND YOU JUST DON'T WANT THE HEAR IT DO YOU?


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IsaChandra

Post subject: Re: Math question Posted: Wed Jun 12, 2013 3:58 pm 

Venomous Head of Veganism 


Joined: Tue Oct 19, 2010 2:21 pm Posts: 8477

Is anyone else having the problem that when you try to read anything in this thread, a soulless chasm opens up on your screen, then when you stick your hand in it's wet and cold?
_________________ "You guys are a little bit fast to identify as notmumbles. " ~ mumbles


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IsaChandra

Post subject: Re: Math question Posted: Wed Jun 12, 2013 3:58 pm 

Venomous Head of Veganism 


Joined: Tue Oct 19, 2010 2:21 pm Posts: 8477

Is anyone else having the problem that when you try to read anything in this thread, a soulless chasm opens up on your screen, then when you stick your hand in it's wet and cold?
_________________ "You guys are a little bit fast to identify as notmumbles. " ~ mumbles


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interrobang?!

Post subject: Re: Math question Posted: Wed Jun 12, 2013 4:05 pm 

Mediocre Tart 


Joined: Wed Oct 20, 2010 2:55 pm Posts: 4571 Location: under the skyscrapers

I felt more like Peter Duncan when he sticks his greenblooded wrist into the bitey tree stump in Flash Gordon.
_________________ "I will take a drugged, sexcrazed, punk rock commie over Mrs. Thatch any day of the week"  Vantine "I have so much more creepiness inside of me that I should share with the world"  bastah


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acr

Post subject: Re: Math question Posted: Wed Jun 12, 2013 4:24 pm 

Nopants hermit 4 lyfe 


Joined: Sun Oct 24, 2010 10:22 am Posts: 3024 Location: BKLN

i heard windchimes, and then a bunny hopped across the screen and everything exploded into rainbow hearts.
_________________ "rise from the ashes of douchebaggery like a fancy vegan phoenix"  amandabear "I'm pretty sure the moral of this story is: fork pants."  cq


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IsaChandra

Post subject: Re: Math question Posted: Wed Jun 12, 2013 4:48 pm 

Venomous Head of Veganism 


Joined: Tue Oct 19, 2010 2:21 pm Posts: 8477

Ohhh I must be in the early phases.
_________________ "You guys are a little bit fast to identify as notmumbles. " ~ mumbles


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Mars

Post subject: Re: Math question Posted: Wed Jun 12, 2013 4:55 pm 

Plays The Sims 2 religiously 


Joined: Wed Oct 20, 2010 11:20 pm Posts: 6775 Location: Portland, OR

I recommend not sticking any other body part in there, Isa...
_________________ i would schmear marmite on a moist scrotum for Mars.  interrobang?! "Not everything." ~ mumbles (19732013)  mumbles


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doncherryfan

Post subject: Re: Math question Posted: Wed Jun 12, 2013 5:08 pm 

Top of the food chain & doesn't need to prove it 


Joined: Wed Oct 20, 2010 4:18 pm Posts: 629 Location: Strictly bridge and tunnel


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