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Topic:
Do you ever lose hope in humanity?
This thread has 27 replies. Displaying posts 1 through 15.
Post 1 made on Wednesday April 13, 2011 at 23:01
Anthony
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On an other thread in an other forum, someone started a poll

what is the answer to
48/2(9+3)

and there are two answers
a) 2
b) 288

roughly half the people voted 2 and even scarier some people are arguing that there is nothing wrong with picking 2 as the answer.
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Post 2 made on Thursday April 14, 2011 at 05:25
antennas
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I think 2 is correct one. what u say
Post 3 made on Friday April 15, 2011 at 12:33
djy
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BODMAS

The answer is 288.
Post 4 made on Friday April 15, 2011 at 14:22
Neurorad
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I don't recall ever knowing that acronym, but I know the answer is 288.
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Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense. -Buddha
OP | Post 5 made on Saturday April 16, 2011 at 13:16
Anthony
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yup the answer is 288
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OP | Post 6 made on Saturday April 16, 2011 at 13:19
Anthony
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On April 15, 2011 at 14:22, Neurorad said...
I don't recall ever knowing that acronym, but I know the answer is 288.

I think it is just the UK equivalent of PEMDAS
I am guessing B=brackets since I know that is what they call parenthesis.
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Post 7 made on Saturday April 16, 2011 at 23:35
djy
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On April 16, 2011 at 13:19, Anthony said...
I think it is just the UK equivalent of PEMDAS
I am guessing B=brackets since I know that is what they call parenthesis.

Yup!
Post 8 made on Monday April 18, 2011 at 12:58
highfigh
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The answer is 2. You perform the function in the denominator first, then divide and anything in parentheses goes first, so you add 9 +3 to get 12, multiply by 2 to get 24, then divide 48 by the denominator (24) to get a quotient of 2.

I pick 2, NTTAWT
My mechanic told me, "I couldn't repair your brakes, so I made your horn louder."
Post 9 made on Monday April 18, 2011 at 14:29
djy
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On April 18, 2011 at 12:58, highfigh said...
The answer is 2. You perform the function in the denominator first, then divide and anything in parentheses goes first, so you add 9 +3 to get 12, multiply by 2 to get 24, then divide 48 by the denominator (24) to get a quotient of 2.

I pick 2, NTTAWT

You wouldn't, perchance, happen to work for this fellow?
OP | Post 10 made on Monday April 18, 2011 at 21:44
Anthony
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On April 18, 2011 at 12:58, highfigh said...
I pick 2, NTTAWT

actually there is something wrong with it, the correct answer is 288

Last edited by Anthony on April 18, 2011 21:58.
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Post 11 made on Tuesday April 19, 2011 at 00:09
Daniel Tonks
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From a lot of reading on that specific problem, the main problem is it's a somewhat ambigious question with unclear bracketing. Like asking someone to spell "color" and they give you "colour", which you deem incorrect.

However automated means (google, programming languages etc.) will always give you 288 as the answer.
Post 12 made on Tuesday April 19, 2011 at 10:57
djy
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On April 19, 2011 at 00:09, Daniel Tonks said...
...the main problem is it's a somewhat ambigious question...

Only if one doesn't understand, or have never been taught, the rules governing the order of operations.
OP | Post 13 made on Tuesday April 19, 2011 at 20:08
Anthony
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On April 19, 2011 at 10:57, djy said...
Only if one doesn't understand, or have never been taught, the rules governing the order of operations.

exactly. Daniel, there is a reason the answer is always 288 in a programming language/scientific calculator because the proper way to calculate what is written will give you 288. The only way it is "ambiguous" is if one assumes the person that wrote it (which is not impossible) did not know the proper way to compute it and so miswrote what he meant
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Post 14 made on Wednesday April 20, 2011 at 00:08
Daniel Tonks
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I'm assuming this is the original thread you were referencing: [Link: physicsforums.com] - some interesting discussion on ths issue.

(And yes, the first time I did it myself I came up with 288.)
Post 15 made on Wednesday April 20, 2011 at 03:44
djy
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But if you set the 2 in the equation to x and set the equation equal to 288, x then = 1/72. Thus proving 2 is the correct answer.

Huh?

48/x(9+3)=288
48/x(12)=288
48/x=288/12
48/x=24
48/24=x
2=x

(it may have been mentioned later on in the thread, but I'm too tired and lazy to look.)
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