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48÷2(9+3) = ????


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Poll: 48÷2(9+3) = ???? (125 member(s) have cast votes)

What's the answer?

  1. 2 (25 votes [20.00%] - View)

    Percentage of vote: 20.00%

  2. 4 (4 votes [3.20%] - View)

    Percentage of vote: 3.20%

  3. Voted 288 (81 votes [64.80%] - View)

    Percentage of vote: 64.80%

  4. sec[log(π)√∞^9001]° (15 votes [12.00%] - View)

    Percentage of vote: 12.00%

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#21
Iamdan
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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.

#22
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Posted the answer in the spoiler tags.
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#23
Giordano
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You needed a professor with a PhD in math to tell you this?

This is like 7th grade stuff.
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#24
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288 was my original answer. I second guessed myself after reading the thread that I mentioned in my first post.

Also, just searched for the thread title and about 20 identical threads came up.
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#25
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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.
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#26
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I was right in my assumption about TIF's Off-Topic, at least :thumbup:
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#27
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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.

What I'd do with a fraction


So am I just doing it completely wrong?

#28
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.

#29
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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.

What I'd do with a fraction


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)].
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#30
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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.
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#31
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48÷2(9+3)
48/ 2(12)
48/24
2


Oddly in my head it came out to 4, but I do see why I'm wrong in either case.

 

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#32
doomy
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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

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#33
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I did a maths a level and i got 2.


:'(

#34
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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.


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#35
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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".

TANSTAAFL


#36
Will H
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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.

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#37
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The answer is definitely 288, but sadly I did get 2 the first time as well (just doing it quick in my head).
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#38
Assume Nothing
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Brackets Indices Division Multiplication Addition Subtraction

Hmm, you're right.

EDIT - Talking of trollmath, could someone explain why this doesn't work?

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#39
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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 = 24
24 *(9+3)
24*12 = 288.

PEMDAS works fine.

#40
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Yeah I did the multiplication first. Makes sense though.

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