POLL: A simple mathematical problerm - Cheat Happens General Discussions Message Board (Page 4)

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 MESSAGE BOARDS >> GENERAL DISCUSSIONS POLL: A simple mathematical problerm

by Neo7
 2 288

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 Latiosmaster47 send PM view profile add to friends User #: 238928 Posts: 8715 Joined: May 18, 2007 Last visit: Aug 28, 2014
 Posted: Apr 08, 2011 3:00:33 PM - Report post (0) (0) post reply

 quote: originally posted by sharp911:i was taught that if we have for eg. only number 2 before parenthesis that means we must multiply whole parenthesis by this number somethin' like this, 2(9+3) it's the same as 2*9 + 2*3 that equals 24. You know what i mean? ;d it was really, really hard to for meh to explain this

That's just a trick that teachers use to help their students with multiplication. If you follow the order of operations, you will get the same answer:

2(9+3)
2(12)
24

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 Rise_Against send PM view profile add to friends User #: 949247 Posts: 462 Joined: Apr 04, 2010 Last visit: Mar 14, 2014
 Posted: Apr 08, 2011 3:01:56 PM - Report post (0) (0) post reply
 Aha I see now. So it really is dependent on the order of operations you were taught.Thanks Neo, I'm going to show this to my maths teacher and see if she can figure it out.
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 Neo7 send PM view profile add to friends User #: 475 Posts: 8053 Joined: Jan 17, 2004 Last visit: Aug 30, 2014
 Posted: Apr 08, 2011 3:23:44 PM - Report post (0) (0) post reply

 quote: originally posted by Rise_Against:Aha I see now. So it really is dependent on the order of operations you were taught.Thanks Neo, I'm going to show this to my maths teacher and see if she can figure it out.

You can convert the division symbol (48 divided by 2) into a multiplication problem (48 multiplied by 0.5). Then following the same pattern used by the before operations to obtain 288. It is a valid rule since no calculations are being made (only using an identity property of multiplication and division)

The strict correct answer is that the syntax of the equation was wrong to begin with.

It boils down to how you read this:
1/2x

Do you read it as (1/2) * x or as 1/(2x). The way it was originally written does not specify the divisor in an explicit way leaving the equation ambiguous

[Edited by Neo7, 4/8/2011 3:24:59 PM]

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 kingnight2 send PM view profile add to friends User #: 707362 Posts: 18 Joined: May 09, 2009 Last visit: Aug 19, 2014
 Posted: Apr 08, 2011 6:36:20 PM - Report post (0) (0) post reply
 you dont even need to solve the full problem to get the answer. Only two options and you quickly learn that one is too small.
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 DABhand send PM view profile add to friends User #: 157287 Posts: 5297 Joined: Aug 27, 2006 Last visit: Aug 29, 2014
 Posted: Apr 08, 2011 7:07:34 PM - Report post (0) (0) post reply
 The answer is 2. Parenthesis definitely always comes first.This was put on 4chan as a troll thread, so when people said 2 they would troll them into thinking it was definitely 288.Show you what I mean.People think its 288 which is wrong.. lets see the equation with the supposed 288 answer 48 = 288-------2(9+3)Cross multiplication then.48 = 288 * 2(9+3) => 48 = 288 * 24 => 48 = 6912 >. 48 = 2 * 24 => 48 = 48 [Edited by DABhand, 4/8/2011 7:14:47 PM]
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 Neo7 send PM view profile add to friends User #: 475 Posts: 8053 Joined: Jan 17, 2004 Last visit: Aug 30, 2014
 Posted: Apr 08, 2011 7:57:26 PM - Report post (0) (0) post reply

 quote: originally posted by DABhand:The answer is 2. Parenthesis definitely always comes first.This was put on 4chan as a troll thread, so when people said 2 they would troll them into thinking it was definitely 288.Show you what I mean.People think its 288 which is wrong.. lets see the equation with the supposed 288 answer 48 = 288-------2(9+3)Cross multiplication then.48 = 288 * 2(9+3) => 48 = 288 * 24 => 48 = 6912 >. 48 = 2 * 24 => 48 = 48 [Edited by DABhand, 4/8/2011 7:14:47 PM]

The thread originated from Team Liquid actually. There was quite the discussion about it there (in fact I think it's still on going)

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 DABhand send PM view profile add to friends User #: 157287 Posts: 5297 Joined: Aug 27, 2006 Last visit: Aug 29, 2014
 Posted: Apr 08, 2011 8:16:15 PM - Report post (0) (0) post reply
 Imagine it as this48÷2(9x+3x)= 0The parenthesis has to be worked out first48÷18x+6x= 048÷24x= 048=24x2=xEven without working out the Parenthesis first48÷2(9x+3x)=048÷2=(9x+3x)24=12x2=x[Edited by DABhand, 4/8/2011 8:18:05 PM]
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 Skyheart send PM view profile add to friends User #: 308147 Posts: 1616 Joined: Oct 07, 2007 Last visit: Aug 30, 2014
 Posted: Apr 08, 2011 9:16:14 PM - Report post (0) (0) post reply
 Throwing my vote in with 288. Good old BODMAS (our English version or the order - Brackets Over Division, Multiplication, Addition and Subtraction). When you hear hoofbeats, don't think Zebra.EDIT: Fixed :P[Edited by moderator DABhand, 4/8/2011 9:18:08 PM]
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