EPTA Simple Math Problem? - Page 18
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Scolgrave
United States27 Posts
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darmousseh
United States3437 Posts
48÷2(9+3) (48÷2)(9+3) ((48÷2)*(9+3)) Now do it | ||
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GizmoPT
Portugal3040 Posts
On April 08 2011 07:08 cYberc0re wrote: This is a very simple PEMDAS(Parenthesis, Exponents, Multiply, Divide, Addition, Subtraction) problem, such as 2+2÷2 = 1, Parenthesis first, so 48÷2(9+3)=48÷2(12) Next is Exponents, but we don't have any, so we go to multiply. 2(12) is multiplication, so that comes next. So we multiply: 48÷2(12)=48÷24 Division after that 48÷24 = 2 We have nothing to add We have nothing to subtract Problem solved. ye thats how i do it but wtv i dont care | ||
MasterOfChaos
Germany2896 Posts
On April 08 2011 07:02 JinDesu wrote: Yep, it's the assumption that the division sign automatically sets everything to the right in a bracket. Writing it out on a board or paper would help. The division sign does exactly what it's supposed to. Divide the left number by the right number. The question isn't about the division sign IMO. It's about the omitted multiplication sign. I argue that an omitted multiplication sign is different from an explicit multiplication sign. | ||
mikeymoo
Canada7170 Posts
It's like reading "cos2x" and arguing that technically it should be equal to cos(2)*x when most people would see cos(2x). I made an assumption about the equation because it's being asked in the first place. Most arithmetically sound people wouldn't ask this question on a forum, so I assumed that the author was bad at math. Someone bad at math would definitely phrase this question as something he/she had seen on his/her homework, that is, they would write 48/(2(9+3)) as seen on homework as what was typed in the poll. Yes, it's technically 288. Usually if it is meant to evaluate to 288, it would be written (48/2)(9+3), for clarity. I'm not embarrassed at all to have answered 2. | ||
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JinDesu
United States3990 Posts
On April 08 2011 07:06 Marradron wrote: where is ÷ on a keyboard anyway ? I dont have it..... I'm copy and pasting it lol... It might be a special char which is normally accessed by holding alt+typing in the numbers On April 08 2011 07:07 micronesia wrote: I am not aware of any difference between / and the other division sign... they both mean the same thing to me. Can anyone point me to a reference that says otherwise? There isn't, but in a single line equation, a lot of people see 1/2x as 1 2x | ||
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micronesia
United States24805 Posts
On April 08 2011 07:09 Scolgrave wrote: Idk why the whole university Pole is in this, this is like...8/9th grade math or something? Because most of the people getting this 'wrong' are either below 9th grade math or are fairly advanced in their math... which makes for an interesting phenomenon if you don't understand why it's happening. It has been discussed pretty extensively in this thread so feel free to read it and understand why if you are curious. | ||
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koreasilver
9109 Posts
On April 08 2011 07:06 micronesia wrote: I don't think distribution means you have to do it before doing 48/2 thus exeexe's work should be okay albeit silly. Urgh, common usage, technicality, etc. | ||
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GizmoPT
Portugal3040 Posts
On April 08 2011 07:10 mikeymoo wrote: It really depends on the context. You would never see a formula typed out linearly like this in any paper. It's like reading "cos2x" and arguing that technically it should be equal to cos(2)*x when most people would see cos(2x). I made an assumption about the equation because it's being asked in the first place. Most arithmetically sound people wouldn't ask this question on a forum, so I assumed that the author was bad at math. Someone bad at math would definitely phrase this question as something he/she had seen on his/her homework, that is, they would write 48/(2(9+3)) as seen on homework as what was typed in the poll. Yes, it's technically 288. Usually if it is meant to evaluate to 288, it would be written (48/2)(9+3), for clarity. I'm not embarrassed at all to have answered 2. same <3 | ||
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chestnutman
176 Posts
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Meta
United States6228 Posts
I learned it as PEDMAS, not PEMDAS. However, Multiplication/Division (and Addition/Subtraction) happens at the same time, in order from left to right. That's why it's 288, and that's why every website you input this problem into will give 288. This problem could be avoided by just adding parenthesis. | ||
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JinDesu
United States3990 Posts
On April 08 2011 07:09 MasterOfChaos wrote: The question isn't about the division sign IMO. It's about the omitted multiplication sign. I argue that an omitted multiplication sign is different from an explicit multiplication sign. That could be it as well - but from your previous poll about 1/2x, it seems people are automatically assigning the 2x in a bracket. | ||
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Marradron
Netherlands1586 Posts
On April 08 2011 07:09 MasterOfChaos wrote: The question isn't about the division sign IMO. It's about the omitted multiplication sign. I argue that an omitted multiplication sign is different from an explicit multiplication sign. Luckily in matlab you're not allowed to write 2y but have to write 2*y. in the wofram site it's allowed and means something different than 2*y. So once again matlab > wolfram  . (not that I have ever used wolfram) | ||
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YokaY
United States108 Posts
On April 08 2011 07:07 micronesia wrote: I am not aware of any difference between / and the other division sign... they both mean the same thing to me. Can anyone point me to a reference that says otherwise? They don't mean anything different. It's just what they create visually and how they affect peoples assumptions. One looks like this A / / / / BC vs. A÷BC vs. A/BC | ||
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TrainFX
United States469 Posts
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GizmoPT
Portugal3040 Posts
On April 08 2011 07:12 YokaY wrote: They don't mean anything different. It's just what they create visually and how they affect peoples assumptions. One looks like this A / / / / BC vs. A÷BC vs. A/BC in my university if they put A÷BC its A÷(B*C) so i dont know why people saying people that get 2 are dumb :\ | ||
Milkis
5003 Posts
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Raelcun
United States3747 Posts
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thesideshow
930 Posts
Do you do what's in the parenthesis/brackets first? 48÷2(9+3) 48÷2(12) 24(12) 288 Or get rid of the parenthesis/brackets first? 48÷2(9+3) 48÷2(12) 48÷24 12 + Show Spoiler + Quick thought: If you do the first method, aren't you doing the division before completely dealing with the brackets, thus violating PEMDAS/BEMDAS? | ||
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koreasilver
9109 Posts
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