Hamtaro Posted April 10, 2011 Author Share Posted April 10, 2011 I was right in my assumption about TIF's Off-Topic, at least :thumbup: Player since 2004. All skills 1M+ XP."If it were possible to cure evils by lamentation..., then gold would be a less valuable thing than weeping." - Sophocles"Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws." - Plato Link to comment Share on other sites More sharing options...
Distracted Posted April 10, 2011 Share Posted April 10, 2011 I risk looking like a complete idiot for asking this, but what if you put it in a fraction? I see why the answer is 288, but when you put the exercise as a fraction it's a different story, right? So purely out of interest, is it different when it's put in a fraction? Or is a fraction mathematically different from a division, since I always thought they were the same. It's just for the sake of knowledge here. [spoiler=What I'd do with a fraction]48-----------2(9+3) 24---------(9+3) 24----12 2--1 Or alternatively: 48---------2(9+3) 48---------2(12) 48----24 2--1 So am I just doing it completely wrong? Link to comment Share on other sites More sharing options...
Iamdan Posted April 10, 2011 Share Posted April 10, 2011 . Link to comment Share on other sites More sharing options...
Gbpackers31 Posted April 10, 2011 Share Posted April 10, 2011 I risk looking like a complete idiot for asking this, but what if you put it in a fraction? I see why the answer is 288, but when you put the exercise as a fraction it's a different story, right? So purely out of interest, is it different when it's put in a fraction? Or is a fraction mathematically different from a division, since I always thought they were the same. It's just for the sake of knowledge here. [spoiler=What I'd do with a fraction]48-----------2(9+3) 24---------(9+3) 24----12 2--1 Or alternatively: 48---------2(9+3) 48---------2(12) 48----24 2--1 So am I just doing it completely wrong? Well actually the (9+3) is not in the denominator to begin with. If you substitute (9+3) for x, you'd get 48/2x. This, however, is equivalent to 48x/2 because it goes by basic order of operations. You divide first and then multiply. So you divide the 2 into 48 and then multiply by x (which would put the x in the numerator). If you wanted to write the equation how you have, you'd need parentheses on the 2x (or brackets on the 2(9+3)). So using x, it would be 48/(2x) and back to the original equation, 48/[2(9+3)]. Link to comment Share on other sites More sharing options...
Riku3220 Posted April 10, 2011 Share Posted April 10, 2011 Also, just searched for the thread title and about 20 identical threads came up. I just did the same thing. It's amazing how many people on the internet don't know how to do basic math and then try to justify that the right answer is 2. With how it's written, it can only be 288, no ifs', and's, or but's about it.Because some people were taught with PEMDAS which puts Multiplication before Division and Addition before Subtraction. This is why GEMA is superior. Link to comment Share on other sites More sharing options...
RpgGamer Posted April 10, 2011 Share Posted April 10, 2011 48÷2(9+3)48/ 2(12)48/242 Oddly in my head it came out to 4, but I do see why I'm wrong in either case. Quote Quote Anyone who likes tacos is incapable of logic. Anyone who likes logic is incapable of tacos. PSA: SaqPrets is an Estonian Dude Steam: NippleBeardTM Origin: Brand_New_iPwn Link to comment Share on other sites More sharing options...
doomy Posted April 10, 2011 Share Posted April 10, 2011 We were taught that it went either multiplication or division depending on which came first. And the fraction mentioned before doesn't work because its really:48 / 2 * (9+3)which is the same as 48 * 12 / 2 so you'd have the *(9+3) on the top Doomy edit: I like sheep Link to comment Share on other sites More sharing options...
Freakyhair Posted April 10, 2011 Share Posted April 10, 2011 I did a maths a level and i got 2. :'( Link to comment Share on other sites More sharing options...
Orpheus Posted April 10, 2011 Share Posted April 10, 2011 The left to right thing isn't true, so you need more brackets. My girlfriend does a math degree and she says that there isn't enough information in that question to answer it properly - brackets to prioritize the division or multiplication. You wouldn't come across something like this in a real math problem afaik because it would have a definite answer with brackets. Heh, is that so? In any case, it seems most of us get 288. And maths are incredibly stupid in this case. I was going to eat hot dogs for dinner tonight. I think I will settle for cereal. OPEN WIDE HERE COMES THE HELICOPTER. Link to comment Share on other sites More sharing options...
Will H Posted April 10, 2011 Share Posted April 10, 2011 I'm pretty sure that it's 288 following BIDMAS, but the syntax of the question is poor. It should read (48/2)(9+3)=. When you express equations in text, you have to be really rigorous with the brackets. Honestly, one of the first rules of maths, don't screw up the syntax when you're asking a question. It's better to have redundant parts than be ambiguous. And if all else fails, stick it in Wolfram Alpha. ~ W ~ Link to comment Share on other sites More sharing options...
indy500fan Posted April 10, 2011 Share Posted April 10, 2011 The answer is definitely 288, but sadly I did get 2 the first time as well (just doing it quick in my head). Link to comment Share on other sites More sharing options...
Assume Nothing Posted April 10, 2011 Share Posted April 10, 2011 Brackets Indices Division Multiplication Addition Subtraction Hmm, you're right. EDIT - Talking of trollmath, could someone explain why this doesn't work? Link to comment Share on other sites More sharing options...
Nenga Posted April 10, 2011 Share Posted April 10, 2011 Also, just searched for the thread title and about 20 identical threads came up. I just did the same thing. It's amazing how many people on the internet don't know how to do basic math and then try to justify that the right answer is 2. With how it's written, it can only be 288, no ifs', and's, or but's about it.Because some people were taught with PEMDAS which puts Multiplication before Division and Addition before Subtraction. This is why GEMA is superior.PEMDAS is fine, it's just that some people forget that in the original explanation (whenever PEMDAS is taught) that Multiplication and Division / Addition and Subtraction are on the same "tier".With PEMDAS all you're really taught is do do exponents and inside parentheses first, after that the problem reads normally from left to right. Keeping in mind, unless the problem says otherwise, parentheses around a number means to multiply. So it's 48/2 = 2424 *(9+3)24*12 = 288. PEMDAS works fine. Ponies! Link to comment Share on other sites More sharing options...
obfuscator Posted April 10, 2011 Share Posted April 10, 2011 Yeah I did the multiplication first. Makes sense though. "It's not a rest for me, it's a rest for the weights." - Dom Mazzetti Link to comment Share on other sites More sharing options...
doomy Posted April 10, 2011 Share Posted April 10, 2011 Brackets Indices Division Multiplication Addition Subtraction Hmm, you're right. EDIT - Talking of trollmath, could someone explain why this doesn't work? I'm not sure if this is right or not, but the second last line is pretty much saying 2*0 = 1*0, and the last step is dividing 0 out from both sides? Doomy edit: I like sheep Link to comment Share on other sites More sharing options...
Assume Nothing Posted April 10, 2011 Share Posted April 10, 2011 Brackets Indices Division Multiplication Addition Subtraction Hmm, you're right. EDIT - Talking of trollmath, could someone explain why this doesn't work? I'm not sure if this is right or not, but the second last line is pretty much saying 2*0 = 1*0, and the last step is dividing 0 out from both sides? Ah, there we go. I just followed what they did and didn't spot that because x = a, x - a = 0 Link to comment Share on other sites More sharing options...
Juhnie Posted April 10, 2011 Share Posted April 10, 2011 The reason people are getting 2 as the answer from their calculators is in the way the calculator processes the problem. It seems to cut the syntax in terms which it will process one by one in the order of operations. DISCLAIMER: Just something I thought up. Nothing official or such :P If you write in 48/2(9+3), some calculators will understand the 2(9+3) a single term with parentheses, ranking the whole term top tier in the order of operations (due to the precense of parentheses) and processes it like this: 48/2(9+3)48/2(12)48/242 before moving on with the calculation. If you write in 48/2*(9+3), however, the calculator separates the (9+3) as a separate term and processes it like this to remove the parentheses: 48/2*(9+3)48/2*1224*12288 I tried this out with my Casio CFX-9850GB PLUS. The result: 48/2(9+3) = 248/2*(9+3) = 288 Agree with Will_H, the syntax is horrible. Master of Attack ~ August 29th, 2010Proud to have served the awesome Tip.It Crew <3 Link to comment Share on other sites More sharing options...
dsavi Posted April 10, 2011 Share Posted April 10, 2011 Interesting, I tried it on some different calculators and got different answers: My desktop calculator (gnome-calculator): 2 Edit: When I typed in 48/2*(9+3) it was 288.PHP ( print 48/2*(9+3); ): 288Python ( print(48/2*(9+3)) ): 288C: 288[spoiler=(Program)]#include <stdio.h> int main(void) { int i = 48/2*(9+3); printf("i is %i\n", i); return 1; } I would assume that the calculator would be more reliable, seeing as it's, you know, a calculator. But apparently not. Link to comment Share on other sites More sharing options...
Orpheus Posted April 10, 2011 Share Posted April 10, 2011 In any case, this problem is not clear enough in terms of what's going with what, even with BIDMAS, PEMDAS, GEMA (what the [bleep] is this). It's not clearly defined how to do this problem correctly. It's still 288 unless brackets/more parentheses say otherwise. I was going to eat hot dogs for dinner tonight. I think I will settle for cereal. OPEN WIDE HERE COMES THE HELICOPTER. Link to comment Share on other sites More sharing options...
Riku3220 Posted April 10, 2011 Share Posted April 10, 2011 In any case, this problem is not clear enough in terms of what's going with what, even with BIDMAS, PEMDAS, GEMA (what the [bleep] is this). It's not clearly defined how to do this problem correctly. It's still 288 unless brackets/more parentheses say otherwise.GEMA is: GroupingExponentsMultiplication and divisionAddition and subtraction Link to comment Share on other sites More sharing options...
iamcoool11 Posted April 10, 2011 Share Posted April 10, 2011 This is how I see it:[spoiler=My solution]48/2(9+3)First do distributive property:48/((9*2)+(3*2))48/242 At least I think it's right...I'm pretty sure that the distributive property ignores PEMDAS, and comes before it. :???:Edit: If I am wrong, feel free to correct me. Link to comment Share on other sites More sharing options...
The Observer Posted April 10, 2011 Share Posted April 10, 2011 I got 288 using the order of operations. Link to comment Share on other sites More sharing options...
Hamtaro Posted April 10, 2011 Author Share Posted April 10, 2011 This is how I see it:[spoiler=My solution]48/2(9+3)First do distributive property:48/((9*2)+(3*2))48/242 At least I think it's right...I'm pretty sure that the distributive property ignores PEMDAS, and comes before it. :???:Edit: If I am wrong, feel free to correct me.Distributive property doesn't take precedence in a monomial equation. Because there are no X-terms, the entire equation is one term. The answer is in spoiler tags in the first post btw. Player since 2004. All skills 1M+ XP."If it were possible to cure evils by lamentation..., then gold would be a less valuable thing than weeping." - Sophocles"Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws." - Plato Link to comment Share on other sites More sharing options...
iamcoool11 Posted April 11, 2011 Share Posted April 11, 2011 This is how I see it:[spoiler=My solution]48/2(9+3)First do distributive property:48/((9*2)+(3*2))48/242 At least I think it's right...I'm pretty sure that the distributive property ignores PEMDAS, and comes before it. :???:Edit: If I am wrong, feel free to correct me.Distributive property doesn't take precedence in a monomial equation. Because there are no X-terms, the entire equation is one term. The answer is in spoiler tags in the first post btw.I'm still confused. I learned it as always being first. I don't know, I'm just not quite getting it. :oops: Link to comment Share on other sites More sharing options...
K4ylan Posted April 11, 2011 Share Posted April 11, 2011 This is how I see it:[spoiler=My solution]48/2(9+3)First do distributive property:48/((9*2)+(3*2))48/242 At least I think it's right...I'm pretty sure that the distributive property ignores PEMDAS, and comes before it. :???:Edit: If I am wrong, feel free to correct me.Distributive property doesn't take precedence in a monomial equation. Because there are no X-terms, the entire equation is one term. The answer is in spoiler tags in the first post btw.I'm still confused. I learned it as always being first. I don't know, I'm just not quite getting it. :oops: Think of the parenthesis as a multiplication sign. So, it would be 48/2×12 --> 24×12 --> 288 ~~~The Harpy List~~~Harpy Facts~~~It's Super Effective~~~The Beginning~~~Harpy Therapy Center~~~Alg~~~Jedi Harpy~~~Rohirrim~~~Attenuation~~~ Link to comment Share on other sites More sharing options...
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