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basic arithmetic problem

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09-22-2009 , 12:10 AM

newb

journeyman

Join Date: Dec 2005 Posts: 299

Too dumb to figure this one out myself

I know the %, being 19
I know the final figure, being 6358.66
Now I need to know the figure on which the 19% was calculated

The answer and the way to solve this much appreciated

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09-22-2009 , 12:17 AM

kattrades

adept

Join Date: Apr 2008 Posts: 922

6358.66/.19 = 33,466.63

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09-22-2009 , 12:25 AM

newb

journeyman

Join Date: Dec 2005 Posts: 299

I`m sorry I must have phrased the problem wrong.

The solution must be in the 5150 ballpark
5150 +19% = 6128.5

What I wan to know is

X +19% = 6358.66

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09-22-2009 , 12:36 AM

kattrades

adept

Join Date: Apr 2008 Posts: 922

Quote:

Originally Posted by newb

I`m sorry I must have phrased the problem wrong.

The solution must be in the 5150 ballpark
5150 +19% = 6128.5

What I wan to know is

X +19% = 6358.66

No problem, newb.
I just rearranged the equation to 6358.66*19% = 1208.15 to get my answer.
6358.66-1208.15 = 5150.50

I think we're on the same page now unless I read something wrong.

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09-22-2009 , 05:58 AM

qpw

banned

Join Date: Jul 2007 Posts: 4,019

Quote:

Originally Posted by kattrades

No problem, newb.
I just rearranged the equation to 6358.66*19% = 1208.15 to get my answer.
6358.66-1208.15 = 5150.50

I think we're on the same page now unless I read something wrong.

But that gives the wrong answer.

You can do it directly by dividing 6358.66 by 1.19 giving 5343.41.

Then check (just in case you don't believe me) by multiplying 5343.41 x 0.19 giving 1015.25 which, added to 5343.41, gives 6358.66.

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09-22-2009 , 06:23 AM

FlyingPanda

centurion

Join Date: Jul 2009 Posts: 171

x * 1.19 = 6358.66

x = 6358.66 / 1.19 = 5343.41

i think you mean this

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09-22-2009 , 06:30 AM

qpw

banned

Join Date: Jul 2007 Posts: 4,019

Quote:

Originally Posted by FlyingPanda

x * 1.19 = 6358.66

x = 6358.66 / 1.19 = 5343.41

i think you mean this

Erm, that's exactly what I said.

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Originally Posted by qpw

You can do it directly by dividing 6358.66 by 1.19 giving 5343.41.

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09-22-2009 , 08:02 AM

kattrades

adept

Join Date: Apr 2008 Posts: 922

That's what I get for multitasking and halfass doing math.

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09-22-2009 , 10:16 AM

newb

journeyman

Join Date: Dec 2005 Posts: 299

Just woke up and very pleased to see the answer.
Thanks for all the contributions

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09-22-2009 , 02:35 PM

#10

Siegmund

Pooh-Bah

Join Date: Feb 2005 Posts: 4,165

May we have an acidic arithmetic problem next, please?

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09-22-2009 , 06:01 PM

#11

madnak

Cooler than Sammy Hagar

Join Date: Aug 2005 Posts: 19,742

Quote:

Originally Posted by Siegmund

May we have an acidic arithmetic problem next, please?

Hydrazoic acid has pK_a = 4.72. What molarity is necessary to create an aqueous solution of pH 3.10?

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09-22-2009 , 06:18 PM

#12

Siegmund

Pooh-Bah

Join Date: Feb 2005 Posts: 4,165

10^-1.48 M, IIRC. Not enough to make a decent-sized bang. What a shame.

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