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Offlines240779
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quick math help (fractions)
    #19168972 - 11/21/13 08:28 AM (10 years, 2 months ago)

Can soemobody help me with this?




New question: http://www.shroomery.org/forums/showflat.php/Number/19210054#19210054


Edited by s240779 (11/30/13 08:24 PM)


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OfflineKingKnowledge
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Re: quick math help (fractions) [Re: s240779]
    #19169004 - 11/21/13 08:40 AM (10 years, 2 months ago)

The first ? is equal to 70/500, or 0.14

The second ? is equal to 70/700, or 0.1



...how old are you out of curiosity? All you need to do it literally flip the fractions.


Edited by KingKnowledge (11/21/13 08:40 AM)


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Invisibleluvdemshrooms
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Re: quick math help (fractions) [Re: KingKnowledge]
    #19169034 - 11/21/13 08:49 AM (10 years, 2 months ago)

Quote:

KingKnowledge said:
...how old are you out of curiosity?




Old enough to get you to do his middle school homework.


--------------------
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Offlines240779
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Re: quick math help (fractions) [Re: s240779]
    #19169041 - 11/21/13 08:53 AM (10 years, 2 months ago)

You can't expect a person to remember something when it's taught to you via silly tricks, and that's how many people are educated.


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InvisibleCyclohexylamine
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Re: quick math help (fractions) [Re: s240779]
    #19169064 - 11/21/13 09:01 AM (10 years, 2 months ago)

Quote:

Da2ra said:
Can soemobody help me with this?






An easy way to figure out fractions is to put them in the following format:

Original:
1/? = 500/70

->
(multiply each by it's opposite, eg: drawing a diagonal line between the two fractions)
1 * 70 = 500 * ?

->
(to remove the 500 from the right side, 500 must be divided from it, and whatever you do to one side you must do to the other, so divide 500 from the other side too).
70 / 500 = ?


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InvisibleNWlight
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Re: quick math help (fractions) [Re: Cyclohexylamine]
    #19169141 - 11/21/13 09:34 AM (10 years, 2 months ago)

On the second problem I would put it as 1/(10^-1) because you aren't supposed to simplify fractions past the lowest common denominator.



on the first problem I would've put 1/((50/7)^-1) for the same reason.


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Edited by NWlight (12/08/13 01:32 AM)


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InvisibleJuicin
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Re: quick math help (fractions) [Re: s240779]
    #19169145 - 11/21/13 09:36 AM (10 years, 2 months ago)

Quote:

Da2ra said:
Can soemobody help me with this?






dude you're not helping yourself by asking this answer

math isn't the kind of subject you can skip basic knowledge on and have any clue what comes later........

For example not being able to work with fractions will haunt you..


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OfflineNotTheDevil
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Re: quick math help (fractions) [Re: Juicin]
    #19169156 - 11/21/13 09:40 AM (10 years, 2 months ago)

Quote:

Juicin said:
Quote:

Da2ra said:
Can soemobody help me with this?






dude you're not helping yourself by asking this answer

math isn't the kind of subject you can skip basic knowledge on and have any clue what comes later........

For example not being able to work with fractions will haunt you..



He's asking for help, not to be spoonfed. getting help is a great way to learn


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OfflineKingKnowledge
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Re: quick math help (fractions) [Re: luvdemshrooms]
    #19169197 - 11/21/13 09:53 AM (10 years, 2 months ago)

Well, here's an easy way to deal with fractions: Cross Multiplication!


All you have to do is multiply the numerator of one with the denominator of the other, and it equals the numerator of the other times the denominator of the other.

For example...

For your first problem. it would be 1*70 = 500*x. Then I'm sure you can solve it!

Quote:

luvdemshrooms said:
Quote:

KingKnowledge said:
...how old are you out of curiosity?




Old enough to get you to do his middle school homework.





I don't mind doing a problem that takes me 3 seconds.


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Offlines240779
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Re: quick math help (fractions) [Re: s240779]
    #19210054 - 11/30/13 08:19 PM (10 years, 1 month ago)

Can somebody help me figure out how much vingear I need to substitute for acetic acid. Been racking my brain about this for the last half hour. And I don't just want the answer, I just want the equation because the vinegar available to me might not be 5%.

Quote:

From "The Alkaloids" Vol. II by Manske (p393). Printed without permission.

ISOLATION OF HARMINE AND HARMALINE

"The crushed seeds of Peganum Harmala are covered with three times their weight of water containing 30 g of acetic acid per liter of water [white vinegar is about 50g / l or 5 %].




http://www.erowid.org/plants/syrian_rue/syrian_rue_extraction2.shtml


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Offlinelifeiswhatyoumake
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Re: quick math help (fractions) [Re: s240779]
    #19210076 - 11/30/13 08:31 PM (10 years, 1 month ago)

You say you've been racking your brain about it for half an hour, ya?
Can you show me what work you've done so far?


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Invisiblepsi
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Re: quick math help (fractions) [Re: s240779]
    #19210120 - 11/30/13 08:44 PM (10 years, 1 month ago)

To figure out how much solution you need, take the mass of seeds in grams and multiply by 3. You can treat the answer as the volume in mL, because a mL of water weighs one gram and the solution is mostly water so that's close enough. Say it was 100 g seeds, you need 300 g or ~300 mL of 3% solution.

3/5 of that (=60% of 300 mL, i.e. 300*.6 = 180 mL) should be the 5% vinegar, and the remaining 40% (300*.4=120 mL) should be water. If the vinegar is of some other purity N% that's at least 3%, you would use 3/N vinegar and (N-3)/N water. If N is 10, you would use 3/10 vinegar and 7/10 water.


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Re: quick math help (fractions) [Re: psi]
    #19210171 - 11/30/13 09:01 PM (10 years, 1 month ago)

1    7
-  =  -
x    5

7*x=1*5
7x=5
x=5/7

cross multiplication


--------------------
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Edited by SkeletalSpore (11/30/13 09:02 PM)


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Offlines240779
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Re: quick math help (fractions) [Re: psi]
    #19214033 - 12/01/13 06:12 PM (10 years, 1 month ago)

Thanks a lot, psi!


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Offlinekoods
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Re: quick math help (fractions) [Re: s240779]
    #19214167 - 12/01/13 06:41 PM (10 years, 1 month ago)

Seriously?


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