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4x+y+2z=100, x>y, y>z, x+y+z=j, 3x+z=k, j>k, j+k=100.

4x+y+2z=100, x>y, y>z, x+y+z=j, 3x+z=k, j>k, j+k=100. WolframAlpha can only give me alternative forms or a solution involving 'real and imaginary parts of z'. Is there a solution I can count on my fingers? [more inside]
posted by obiwanwasabi on Jul 22, 2014 - 13 answers

What to include in a training on maths for business people?

I've been asked at work to come up with a list of topics that could be included in a training course around basic maths for business people, and I am finding it hard to find suggestions for topics. [more inside]
posted by StephenF on Jan 14, 2014 - 12 answers

Help me understand fractions

Dear math people: please help me understand fractions and ratios intuitively. [more inside]
posted by anonymous on Jun 19, 2013 - 29 answers

Dealing with percentages: noob question

I've recently decided to transition to a new career path, accounting. Most firms round here do an online numeracy test as part of the application process. There is a type of % change question that often comes up and I can't find a proper answer about how to calculate it. There are two formulae suggested by different websites, but they give different answers. Which is right? (details inside) [more inside]
posted by NoiselessPenguin on May 28, 2013 - 10 answers

Masters in maths? Difficulty level: Have bachelors in graphic design

Dear Mefites, a long time ago I got a degree in graphic design but never worked in the industry. Along the way I somehow (don't remember how or why or when) became interested in math and I finished a graduate diploma in maths as a distance learning course in my free time. I am considering applying for masters programmes in maths or related subjects but ... can I? Should I? [more inside]
posted by Cat Set Go on Mar 31, 2013 - 10 answers

Weighted mean

Mathematics-filter: If there are seven funds with various charges, how can I work out the allocation to these funds of a fixed amount so that the weighted mean charge is below a certain level and the allocations are of similar sizes? [more inside]
posted by djgh on Dec 31, 2012 - 13 answers

What should my sample size be?

Say that I have a bag which contains 100 balls and every ball in the bag should be red, but it's possible that one or more of these balls is the wrong colour. How many balls should I look at to be 90% sure that all the balls are red? Or 95%? Or 99.9%? Talk me through how to work this out, please?
posted by xchmp on Nov 12, 2012 - 14 answers

Percentage Calculation

I know the price of something now and what the price was 2 years ago - how do I calculate that as an annual percentage increase? [more inside]
posted by jontyjago on Oct 19, 2012 - 12 answers

How do I calculate the probability of a specific sum of repeated die rolls?

I'm looking to learn how to calculate probabilities for a multi-round dice game. I've researched this question some, and it looks like I might need to know how to use the multinomial distribution, but I can't find any good introductions. Please point me to the most layman-accessible educational material on this subject, and help me to help myself. [more inside]
posted by Richard Daly on Sep 28, 2012 - 6 answers

Getting my math(s) right.

Maths (math) people of the US: I need your help in working out if certain British conventions would be understood or standard in the US classroom. [more inside]
posted by cincinnatus c on Jul 10, 2012 - 15 answers

What is the difference between floating point accuracy and precision?

What is the difference between floating point accuracy and precision?
posted by conrad101 on Jan 2, 2012 - 10 answers

If an geeky child is traveling South at 839 MPH, and his nerdy dad is going North at...

My son, who is finishing up third grade, loves math and especially the basic Algebra he's been doing. He is actually sad to be leaving school for the summer because he's so into it. How can I keep this going for him over the summer? Fun books, board games, computer (on-line and OSX) games? [more inside]
posted by bondcliff on Jun 8, 2011 - 42 answers

Did Anyone Invent Some New Math Stuff So They Could Solve A Problem Which Then Lead To a Technological Breakthrough?

Can you cite any examples where a technological breakthrough wasn't possible until there was some sort of mathematical breakthrough? [more inside]
posted by Brian Puccio on Apr 6, 2011 - 32 answers

Answering to Sir What is x

But Sir, what is x? Teaching students algebra for the first time. They keep wanting to put values in for x, and write that down. E.g. x + x = . Becomes 1 + 1 = 2, in their books. Whereas I want x + x = 2x. Does anyone have any strategies, or techniques to overcome this? [more inside]
posted by 92_elements on Nov 11, 2010 - 23 answers

I NEED MATHS! How do I slow this track down to -800%?

How do I reduce something by -800% when I'm working with a scale between -99% and 99%? [more inside]
posted by tunestunes on Sep 13, 2010 - 15 answers

An awesome vector geometry teaching website

I'm trying to find a website that teaches vector mathematics in lesson form. [more inside]
posted by giggleknickers on May 3, 2010 - 2 answers

ISO Ramanujan's high-res handwriting.

Can someone help me get high-res scans of Ramanujan's notebooks? [more inside]
posted by wemayfreeze on Mar 26, 2010 - 6 answers

What is the next step of this Kenken?

What is the next step of this Kenken? [more inside]
posted by johnofjack on Jan 30, 2010 - 23 answers

You are Socrates, I am Meno's slave.

Please explain what calculus is to a dummy. [more inside]
posted by Sova on Jan 17, 2010 - 48 answers

Help with a Martin Gardner maths riddle, please!

Help with a Martin Gardner maths riddle, please! [more inside]
posted by laumry on Jan 16, 2010 - 20 answers

Grapher: How do I animate a parameter?

How do you animate a parameter in the OSX Grapher utility? [more inside]
posted by b1tr0t on Nov 1, 2009 - 3 answers

Permutations: an extension of the odd sock problem

I've annoyed myself by getting stuck attempting to work out a silly maths problem relating to permutations. It's an extension of the 'how many odd socks do I have to pull out of a drawer before I find a pair' problem. Only my theoretical sock-wearer has three legs. And a penchant for odd socks. [more inside]
posted by Beautiful Screaming Lady on Sep 1, 2009 - 7 answers

Math? Maths? Mathesises? Mathelesalizes? Mathematisessizes?

When did "Maths" change to "Math" in American English? Or is it the other way around? [more inside]
posted by fishmasta on Jul 11, 2009 - 39 answers

Game theory for people who like words and pictures?

Best books, websites, lecture series on game theory and its applications for smart people who understand mathematics but can't stand trawling through pages of unnecessary complex formulae?
posted by vizsla on Jan 26, 2009 - 8 answers

Did the earth move for you too?

GISfilter -- I have a PostGIS table containing spatial data in the form of a few thousand shapefiles. Anybody know a quick way I can move *all* of them by about 40 metres? [more inside]
posted by genghis on Jan 10, 2009 - 11 answers

Help me relearn mathematics and its practica applications

Applied Math Filter: Help me use math! I'd like to learn more about mathematics and it's practical applications - particularly in Computer Science [more inside]
posted by dcbarker on Aug 1, 2008 - 13 answers

How can I help my (nearly) seven year old son "get" maths?

How can I help my 6 1/2 year old son to *get* maths? It hasn't clicked with him at all and I find myself getting frustrated with having to repeat really basic stuff when helping him with his homework. I'm not a maths genius myself and I really don't want to put him off by getting cranky because he's just not getting it. How do I help him get it? [more inside]
posted by h00py on Jul 30, 2008 - 35 answers

Tips for university teaching

Teaching a university course for the first time: any tips or suggestions? [more inside]
posted by onoclea on Dec 12, 2007 - 33 answers

Why the inconsistent derivatives?

Where am I going wrong with this (very simple) implicit derivative? [more inside]
posted by PuGZ on Nov 3, 2007 - 3 answers

Inequalities and direction-flipping

Why is it that when I solve the inequality 0 ≤ arccos(x) <> cos(π/4)? Why do the operators switch direction? [more inside]
posted by PuGZ on Oct 19, 2007 - 11 answers

mathematics chess book?

is there a book on the mathematics of chess? [more inside]
posted by randomizer on Oct 18, 2007 - 6 answers

Difficult as ABC

ABC x D = BADC. What single numbers (1-9) do the letters represent? Is there any way to arrive at the answer (a) by logical deduction all the way rather than with some trial-and-error and (b) so that a 10-year-old can follow the logic? [more inside]
posted by londongeezer on Sep 16, 2007 - 15 answers

Equation solving help for the intellectually challenged

(x + y)-(x*y)=79. What are x and y? [more inside]
posted by prentiz on Jun 4, 2007 - 17 answers

Help me understand modulus operators

My maths skills are rubbish. Help me understand modulus remainders [more inside]
posted by TheDonF on Aug 8, 2006 - 10 answers

simplifying ratios and fractions

Is there a mathematical technique for simplifying ratios/fractions? [more inside]
posted by lunkfish on Dec 17, 2005 - 21 answers

Math problem

A crystal consists of 100,000,000 layers of atoms such that there is 1 atom in the first layer, 3 in the second, 6 in the third, 10 in the fourth, 15 in the fifth, and so forth. Exactly how many atoms are there in the entire crystal? [more inside]
posted by Kwantsar on Oct 8, 2005 - 8 answers

Maths tutorial software

I am trying to find some good interactive Maths tutorial software which goes from basic algebra through to Differential Equations and maybe beyond. Can anyone recommend anything with the emphasis on the interactive side - something which can keep me interested so nothing too dry - a nice colorful multimedia approach would be ideal.
posted by empedia on Jun 12, 2005 - 2 answers

Why does a major key sound confident and happy, while a minor key can sound sinister or sad?

How can a major key sound confident and happy, while a minor key can sound sinister or sad? Is it just centuries of musical brainwashing, or is there a real mathematical explanation?
posted by Pretty_Generic on May 7, 2004 - 16 answers

Recommend books/resources for amateur to learn mathematics

I'd like to learn Math. I'm particularly interested in learning trig and calculus. I'm don't need to learn these disciplines for any purpose. I'm just interested. I'm a reasonably bright guy, with a logical mind (I've worked as a programmer), and I'm a good self-learner. I'm not in a rush (don't mind working at this for a few years). What books/resources would you recommend? I should probably go all the way back to Algebra, which is pretty much where I left off in High School years ago.
posted by grumblebee on Dec 27, 2003 - 12 answers

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