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| 48�2(9+3)=? |
| 2 |
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57% |
[ 16 ] |
| 288 |
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42% |
[ 12 ] |
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| Total Votes : 28 |
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MyNameIsNobody
Joined: 12 Jan 2011
Location: Here
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 Posted: Sat Apr 09, 2011 7:14 am Post subject: What does... |
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| Mr. Peabody wrote: |
| Mr. Peabody wrote: |
Answer
48
__ * (9+3) = 288
2
It's not 48/(2(9+3)) = 2
You are adding brackets that don't exist.Either way, the equation is poorly written. |
| MyNamwIsNobody wrote: |
| In order for 2 to be the solution, the formula would have to be written with additional parentheses: |
duh...that's what I said...  |
Well, sorry I didn't give you credit along with RMNC and Google, but I wouldn't classify this as a "duh" topic. People are getting the answer 2 as well as 288. Of course what you and I have written mean the same thing. However, you solved the problem in one step, and I took several for clarity. Obviously, I am not clarifying for you.
silkhighway: I'm not familiar with Polish notation. To get the answer 288 for the original problem, would the equation be written this way:
x � 48 2 + 9 3 = 288
and to get 2 as your answer this way:
� 48 x + 9 3 2 = 2
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silkhighway
Joined: 24 Oct 2010
Location: Canada
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| Posted: Sat Apr 09, 2011 8:06 am Post subject: Re: What does... |
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| MyNameIsNobody wrote: |
silkhighway: I'm not familiar with Polish notation. To get the answer 288 for the original problem, would the equation be written this way:
x � 48 2 + 9 3 = 288
and to get 2 as your answer this way:
� 48 x + 9 3 2 = 2
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The answer works out the same, but keeping the numbers in the same order, it's the following:
* � 48 2 + 9 3 = 288
� 48 * 2 + 9 3 = 2
Sorry..computer science nerdiness..what a thread killer  |
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MyNameIsNobody
Joined: 12 Jan 2011
Location: Here
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| Posted: Sat Apr 09, 2011 8:48 am Post subject: What does... |
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| Thanks for the correction. I wasn't sure about shifting the numbers around. |
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cyui
Joined: 10 Jan 2011
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| Posted: Sat Apr 09, 2011 9:17 am Post subject: |
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,....symbol: (∞).......2 is closest to infinity,so everything in this equation acts as a "determinite" without bound..
i=0 in x value that continues to grow in infinitesimus quality.. :shock: |
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Mr. Peabody
Joined: 24 Sep 2010
Location: here
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| Posted: Sat Apr 09, 2011 10:07 am Post subject: |
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| RMNC wrote: |
Something must be wrong on your end. That link for me goes to google.com's calculator, with the equation and answer as 288. |
Now that is perplexing!
I'm seeing Google Korea's search page....  |
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silkhighway
Joined: 24 Oct 2010
Location: Canada
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| Posted: Sat Apr 09, 2011 10:59 am Post subject: Re: What does... |
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| MyNameIsNobody wrote: |
| Thanks for the correction. I wasn't sure about shifting the numbers around. |
And just for kicks and giggles we could also use Reverse Polish Notation :
48 2 9 3 + * � = 2
48 2 � 9 3 + * = 288
This is computer science-y stuff, but in math, context and readability are just as important as removing ambiguity like the PEDMAS rules are designed to do. I would discourage my students from writing equations like the one in the poll. |
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cyui
Joined: 10 Jan 2011
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| Posted: Sat Apr 09, 2011 11:29 am Post subject: |
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2=y-x .. (0)(2)=xy/04
02>03 ...yyx=(5-2).....
2> 0...005< 3 :lol: |
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cyui
Joined: 10 Jan 2011
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| Posted: Sat Apr 09, 2011 1:23 pm Post subject: |
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| Thank you for the Polish link.. :P |
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Draz
Joined: 27 Jun 2007
Location: Land of Morning Clam
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| Posted: Sat Apr 09, 2011 3:44 pm Post subject: |
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I still maintain Google is the one adding extra brackets that don't exist.
(48 � 2) * (9 + 3) = 288 is not 48�2(9+3)
Or not necessarily. It could be. We need a word problem version to get to the bottom of this. |
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silkhighway
Joined: 24 Oct 2010
Location: Canada
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| Posted: Sat Apr 09, 2011 4:29 pm Post subject: |
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| Draz wrote: |
I still maintain Google is the one adding extra brackets that don't exist.
(48 � 2) * (9 + 3) = 288 is not 48�2(9+3)
Or not necessarily. It could be. We need a word problem version to get to the bottom of this. |
Wolfram Alpha agrees with Google. But look how they re-formatted the equation..it's much clearer. |
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Underwaterbob
Joined: 08 Jan 2005
Location: In Cognito
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| Posted: Sun Apr 10, 2011 5:12 pm Post subject: |
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Yes, 288. It's just a poorly written-out equation.
More math nerdiness:
a=b (multiply both sides by a)
a^2=ab (add a^2 to both sides)
a^2+a^2=a^2+ab (simplify)
2a^2=a^2+ab (subtract 2ab from both sides)
2a^2-2ab=a^2+ab-2ab (simplify)
2a^2-2ab=a^2-ab (factor out a^2-ab)
2(a^2-ab)=1(a^2-ab) (divide both sides by a^2-ab)
2=1 |
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cyui
Joined: 10 Jan 2011
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| Posted: Sun Apr 10, 2011 5:36 pm Post subject: |
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Came up with this earlier: xx/Y ( (∞)
-both x's equal to 1 and y equal to 1... |
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jvalmer
Joined: 06 Jun 2003
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| Posted: Sun Apr 10, 2011 6:00 pm Post subject: |
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| Equation is ambiguous, poorly written. Would not be put on a standard test unless the test is meant to test ambiguous things. |
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silkhighway
Joined: 24 Oct 2010
Location: Canada
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| Posted: Sun Apr 10, 2011 7:05 pm Post subject: |
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| Underwaterbob wrote: |
Yes, 288. It's just a poorly written-out equation.
More math nerdiness:
a=b (multiply both sides by a)
a^2=ab (add a^2 to both sides)
a^2+a^2=a^2+ab (simplify)
2a^2=a^2+ab (subtract 2ab from both sides)
2a^2-2ab=a^2+ab-2ab (simplify)
2a^2-2ab=a^2-ab (factor out a^2-ab)
2(a^2-ab)=1(a^2-ab) (divide both sides by a^2-ab)
2=1 |
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silkhighway
Joined: 24 Oct 2010
Location: Canada
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| Posted: Sun Apr 10, 2011 7:13 pm Post subject: |
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WE may as well make this the thread of math nerdiness, kind of like the chess club of Dave's ESL Cafe.
I have two 1L jugs. In one jug I have red wine and in the other jug I have water. I take exactly one teaspoon of wine from the wine jug and pour the teaspoon in the water jug. I then swirl around the water jug until it's slightly purplish. I then take exactly one teaspoon of the water/wine mix from the water jug and pour that teaspoon in the wine jug.
Now is there more wine in the water jug, or more water in the wine jug? |
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