Author Topic: 3 simple rule - something  (Read 2687 times)

0 Members and 1 Guest are viewing this topic.

Offline Munchor

  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 6199
  • Rating: +295/-121
  • Code Recycler
    • View Profile
3 simple rule - something
« on: February 15, 2011, 04:15:04 pm »
In portuguese, we have something called 'Regra de 3 Simples', and I'd like to know what it is called in English:


1  -   4
2  -   x

x = (2*4)/1
x = 8

It's used in direct proportions, what's it called, do you have a name for it?
« Last Edit: February 16, 2011, 02:55:06 pm by Scout »

Offline Happybobjr

  • James Oldiges
  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2325
  • Rating: +128/-20
  • Howdy :)
    • View Profile
Re: 3 simple rule - something
« Reply #1 on: February 15, 2011, 04:19:53 pm »
Do you mean x=4?
If so i think you mean cross-multiplying.

Side note:  Is the irc down?
School: East Central High School
 
Axe: 1.0.0
TI-84 +SE  ||| OS: 2.53 MP (patched) ||| Version: "M"
TI-Nspire    |||  Lent out, and never returned
____________________________________________________________

Offline Fast Crash

  • LV4 Regular (Next: 200)
  • ****
  • Posts: 192
  • Rating: +45/-7
  • Virus of tomorrow
    • View Profile
Re: 3 simple rule - something
« Reply #2 on: February 15, 2011, 04:31:45 pm »
Yes the irc is down

Offline jnesselr

  • King Graphmastur
  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2270
  • Rating: +81/-20
  • TAO == epic
    • View Profile
Re: 3 simple rule - something
« Reply #3 on: February 15, 2011, 09:48:34 pm »
Cross multiplying is what it is called, yes.  And x does in fact equal 8, it's just that he did x=(2*4)/2 when it should have been x=(2*4)/1.  He knew what he was doing, he just didn't. ;-)

Offline Happybobjr

  • James Oldiges
  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2325
  • Rating: +128/-20
  • Howdy :)
    • View Profile
Re: 3 simple rule - something
« Reply #4 on: February 15, 2011, 10:04:01 pm »
Opps, only looked at the last parts.
School: East Central High School
 
Axe: 1.0.0
TI-84 +SE  ||| OS: 2.53 MP (patched) ||| Version: "M"
TI-Nspire    |||  Lent out, and never returned
____________________________________________________________

Offline PeonHero

  • LV3 Member (Next: 100)
  • ***
  • Posts: 70
  • Rating: +13/-5
  • Coder of Tomorrow, Coding Today.
    • View Profile
Re: 3 simple rule - something
« Reply #5 on: February 15, 2011, 10:21:45 pm »
Cross multiplying was such an easy topic in school, easy on the calculator too.
There are a lot of<a href="http://justmegawatt.com/images/youdidntknow"> Things you didn't know </a>about until you clicked that link.

Offline apcalc

  • The Game
  • CoT Emeritus
  • LV10 31337 u53r (Next: 2000)
  • *
  • Posts: 1393
  • Rating: +120/-2
  • VGhlIEdhbWUh (Base 64 :))
    • View Profile
Re: 3 simple rule - something
« Reply #6 on: February 15, 2011, 10:23:35 pm »
To confuse people, I always like saying, "Solve using the fact that the product of the means is equal to the product of the extremes" :)
« Last Edit: February 15, 2011, 10:23:46 pm by apcalc »


Offline Munchor

  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 6199
  • Rating: +295/-121
  • Code Recycler
    • View Profile
Re: 3 simple rule - something
« Reply #7 on: February 16, 2011, 02:55:24 pm »
"Cross multiplying"

Thanks ;D