REVscene Automotive Forum

REVscene Automotive Forum (https://www.revscene.net/forums/)
-   Vancouver Off-Topic / Current Events (https://www.revscene.net/forums/vancouver-off-topic-current-events_50/)
-   -   48÷2(9+3) (https://www.revscene.net/forums/642682-48%F72-9-3-a.html)

Teh Doucher 04-12-2011 12:06 PM


Presto 04-12-2011 12:20 PM

Quote:

Originally Posted by T.T (Post 7387107)
it's ambiguous because when someone asks you to interpret 1/2x you don't know whether they mean (1/2)x or 1/(2x). 9 times out of 10 they mean 1/(2x) because the 2 and the x are implied to be together and they are either lazy (bastards!) or don't know how to use brackets to avoid confusion.

I'm not saying interpreting it as 1/(2x) is 'correct'. The first thing I would do is get them to clarify if they mean

(1/2)x or
1/(2x)

that's the proper way to type out the equation to avoid confusion.

I can understand the need for clarification once you start having to solve for 'x', but you kinda lost me on the ambiguity of this thread's particular equation. Though poorly written, it's written in a way that is solvable with conventional means. There's not really any other way to approach it differently, if a person knows the rules.

flagella 04-12-2011 12:23 PM

rofl at all these debates. Those who have done enough math will naturally think it's 48/2(9+3) and get 2. Those who got numbers other than 2, no amount of explanations will help you.

Sandman 04-12-2011 12:29 PM

LOL at 68 votes for 2, and how Presto is just repeating the same thing over and over.

buddy 04-12-2011 12:37 PM

^ we can't fail Mod anyway ...

Quote:

Originally Posted by Great68 (Post 7386940)
Typed verbatim into my Sharp scientific calculator, It gets 2.

http://www.revscene.net/forums/attac...1&d=1302631199

hotjoint 04-12-2011 12:42 PM

everyone here at work including myself say the answer is 288

Presto 04-12-2011 12:44 PM

Fuck your calculators.
http://i56.tinypic.com/16h6ja8.png
Solve it like a child in the 80s. Why don't one of you 71 savants walk me through how you came to the answer of 2?

Great68 04-12-2011 12:54 PM

Wow with the way Presto is going on about this you'd think we're pissing on his Doctorate of Mathematics paper.

Gt-R R34 04-12-2011 12:57 PM

THIS THREAD IS EPIC.

Time to ask a bunch of my staff what they get.

Got some Accutaries here. LOL this should be epic.

Nightwalker 04-12-2011 12:59 PM

48÷2(9+3)

is the same as:

48 ÷ 2 x (9+3)

So:

48 ÷ 2 x 12

24 x 12

288

Yeah?

TOS'd 04-12-2011 01:05 PM

48÷2(9+3) = 42

/thread

Nightwalker 04-12-2011 01:20 PM

Quote:

Originally Posted by TOS'd (Post 7387200)
48÷2(9+3) = 42

/thread

The answer is right, but what is the question?

:fullofwin:

twitchyzero 04-12-2011 01:22 PM

Quote:

Originally Posted by Presto (Post 7387172)
Why don't one of you 71 savants walk me through how you came to the answer of 2?

it was posted many times on page one and two. Like i said if you break it down into numerator and denominator you can see why the answer is two.

taylor192 04-12-2011 01:47 PM

Quote:

Originally Posted by Presto (Post 7387026)
Sorry, how is the equation ambiguous? I really don't see how this can be. Is BEDMAS invalidated now that people are plugging numbers into the calculator? What rule are people using to come to the answer 2?

I wish we could fail mods, especially ones on a power trip. Thankfully, there's at least one member on here that gets it:

Quote:

Originally Posted by T.T
it's ambiguous because when someone asks you to interpret 1/2x you don't know whether they mean (1/2)x or 1/(2x). 9 times out of 10 they mean 1/(2x) because the 2 and the x are implied to be together (kinda like the 2(9+3) here) and they are either lazy (bastards!) or don't know how to use brackets to avoid confusion.

I'm not saying interpreting it as 1/(2x) is 'correct'. The first thing I would do is get them to clarify if they mean

(1/2)x or
1/(2x)

that's the proper way to type out the equation to avoid confusion.

Its funny, even with this, some people don't get it:

Quote:

Originally Posted by Presto
I can understand the need for clarification once you start having to solve for 'x', but you kinda lost me on the ambiguity of this thread's particular equation. Though poorly written, it's written in a way that is solvable with conventional means. There's not really any other way to approach it differently, if a person knows the rules.

I'll try and break it down into more simple terms for you:

Do you know what a unary operation is? Its an operation with only 1 operand. ie: -3

So what's the outcome of this?
-3^2

it could be:
-(3^2) = -9
(-3)^2 = 9

Cause BEDMAS does not apply to unary operators.

Notice how this equation is missing an operand between the "2" and the "(". We can assume this is an unary operand, in which case it could be expanded to either:
48 / [2 * (9+3)] = 2
48 / (2) * (9+3) = 288

Usually unary operands get evaluated first, anyone who develops software knows this cause "++" is a unary operand. Thus why some calculators are returning the answer as 2.

There's your math lesson for the day.

Presto 04-12-2011 01:52 PM

^^^

Why assume anything? As soon as you have to throw in shit like unary to make it work, then you've already missed the point. Solve it like it's presented. Don't assume anything other than what is there. With the information that's presented (the equation), it's solvable by anyone with a grade school education.

LiquidTurbo 04-12-2011 01:54 PM

Quote:

Originally Posted by TOS'd (Post 7387200)
48÷2(9+3) = 42

/thread

Quoted, to immortalize your stupidity... :fullofwin:

carisear 04-12-2011 01:57 PM

Quote:

Originally Posted by LiquidTurbo (Post 7387255)
Quoted, to immortalize your stupidity... :fullofwin:


... you just Timpo'd ... you just don't get it.

Oleophobic 04-12-2011 01:58 PM

SpuGen = laughing his ass off right now

taylor192 04-12-2011 02:00 PM

Quote:

Originally Posted by Presto (Post 7387252)
^^^

Why assume anything? As soon as you have to throw in shit like unary to make it work, then you've already missed the point. Solve it like it's presented. Don't assume anything other than what is there. With the information that's presented (the equation), it's solvable by anyone with a grade school education.

You cannot solve it as presented. You are assuming "2(" expands to "2 * (" since there is no rule for a bracket being an operator.

I understand where you're coming from, cause yes it is solvable by anyone with JUST a grade school education of BEDMAS. I have 4 years of university math, in particular physics and electronics math that is only solvable with assumptions. Thus my eye is more critical than the simple mind of a grade schooler who is going to assume "2(" expands to "2 * (".

As I pointed out, even my development environment is smart enough to warn me the equation is ambiguous - which is a far cry from grade school math.

Ronin 04-12-2011 02:03 PM


taylor192 04-12-2011 02:05 PM

Presto, no hard feelings. This is just the "plane on a conveyor belt" question all over again. We can debate this till the end of time - it all comes down to what assumptions you make.

My 4th year electronics prof never cared if we got the same answer as he did, he cared that we could justify our assumptions getting to our answer.

Presto 04-12-2011 02:21 PM

No problem. You mention that there is no rule for bracket being an operator. I've always understood that no operator between the number and bracket means multiplication. Is that where the ambiguity comes from? Due to language of the software?

Jgresch 04-12-2011 02:29 PM

I always assumed that meant multiplication.
Posted via RS Mobile

taylor192 04-12-2011 02:40 PM

Quote:

Originally Posted by Presto (Post 7387299)
I've always understood that no operator between the number and bracket means multiplication. Is that where the ambiguity comes from?

:)

That's exactly where the ambiguity comes from. We can solve the ambiguity by figuring out where your understanding comes from. I couldn't find a hard rule about a bracket being a multiply operator - yet if you can, then no more ambiguity. :thumbsup: Yet until you do, your understanding is actually an assumption. :p

LUUUUUUUU 04-12-2011 02:47 PM

math sux


All times are GMT -8. The time now is 06:55 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.
SEO by vBSEO ©2011, Crawlability, Inc.
Revscene.net cannot be held accountable for the actions of its members nor does the opinions of the members represent that of Revscene.net