POLL: A simple mathematical problerm - Cheat Happens General Discussions Message Board (Page 9)

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

by Neo7
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 forty-two send PM view profile add to friends User #: 98666 Posts: 5854 Joined: Nov 19, 2005 Last visit: Mar 27, 2015
 Posted: Apr 15, 2011 5:49:30 AM - Report post (0) (0) post reply
 Treat the (3+12) as X48/2(X)Now, read it out loud.Did you say "48 divided by 2X" or "48 divided by 2 times X"? 48 divided by 2X results in 2. 48 divided by 2, times X results in 288. It's all about how you read it, there is no correct answer because it is written wrong.
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 Paper_Masochist send PM view profile add to friends User #: 1163763 Posts: 11 Joined: Apr 11, 2011 Last visit: Mar 13, 2015
 Posted: Apr 15, 2011 5:52:03 AM - Report post (0) (0) post reply
 Both answers are right because the syntax is ambiguous. Rules of mathematics don't account for ambiguous syntax.Edit: My first post and I was ninja'd. Hah, ouch. =)[Edited by Paper_Masochist, 4/15/2011 5:57:03 AM]
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 latios_power send PM view profile add to friends User #: 150421 Posts: 6173 Joined: Jul 21, 2006 Last visit: Mar 25, 2015
 Posted: Apr 15, 2011 6:08:33 AM - Report post (0) (0) post reply

 quote: originally posted by forty-two:Treat the (3+12) as X48/2(X)Now, read it out loud.Did you say "48 divided by 2X" or "48 divided by 2 times X"? 48 divided by 2X results in 2. 48 divided by 2, times X results in 288. It's all about how you read it, there is no correct answer because it is written wrong.

Yeah it depends on how you read it, But tell Neo this because he said that we can't say both answer are right, it's "mathematically" wrong.
Y U NO TELL US THE ANSWER

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 Vegetta send PM view profile add to friends User #: 123138 Posts: 3465 Joined: Mar 05, 2006 Last visit: Mar 22, 2015
 Posted: Apr 16, 2011 12:03:00 AM - Report post (0) (0) post reply
 @Latios_powerI am sure that scientific calculators do not know what even means "order of operations". .Think the problem like this:48/2(9+3)=48/2*18=48*0.5*18=288Do i have something wrong? Division is an inverse multiplication, is it?
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 Paper_Masochist send PM view profile add to friends User #: 1163763 Posts: 11 Joined: Apr 11, 2011 Last visit: Mar 13, 2015
 Posted: Apr 17, 2011 3:03:36 AM - Report post (0) (0) post reply

 quote: originally posted by Vegetta:@Latios_powerI am sure that scientific calculators do not know what even means "order of operations". .Think the problem like this:48/2(9+3)=48/2*18=48*0.5*18=288Do i have something wrong? Division is an inverse multiplication, is it?

You're perfectly correct (aside from the 18), however the confusion here is with the brackets.

In my country, and apparently plenty of others, when we have a number like 2(9+3) we do something called expand the brackets*. So to people in Australia/other countries the sum would be understood as:

48/(2x(9+3))
=2

Which is why I feel so smug right now, as your syntax for the sum I interpreted is ugly, meanwhile our syntax for the way you interpret it:

48/2x(9+3)

Is fine.

*www.teacherschoice.com.au/maths_library/algebra/alg_2.htm

[Edited by Paper_Masochist, 4/17/2011 3:04:04 AM]

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 Neo7 send PM view profile add to friends User #: 475 Posts: 8332 Joined: Jan 17, 2004 Last visit: Mar 27, 2015
 Posted: Apr 28, 2011 9:03:44 AM - Report post (0) (0) post reply
 Back to this again.I asked my mathematics professor (Ph.D. in mathematics). He says the answer is 288 becaues the divisor of the division problem is always the length of one real number unless specificed by a sub-equation completely encased in parenthesis/brackets (with the open parenthesis/bracket occuring immediately after the division symbol).48/2(3+9) = 28848/[2(3+9)] = 2
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 yacker send PM view profile add to friends User #: 359205 Posts: 1 Joined: Dec 02, 2007 Last visit: Jan 18, 2015
 Posted: Apr 28, 2011 10:22:10 AM - Report post (0) (0) post reply
 BODMAS, I remember from school in the 80`s
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 64 send PM view profile add to friends User #: 943592 Posts: 142 Joined: Mar 27, 2010 Last visit: Jun 04, 2014
 Posted: Apr 28, 2011 2:20:17 PM - Report post (0) (0) post reply
 48/2(9+3)=48/2(12)=48/2*12=48/24=2
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