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View Poll Results: 48÷2(9+3) = ???
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48÷2(9+3) = ???

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Old 08 April 2011, 04:17 PM
  #1  
alloy
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Default 48÷2(9+3) = ???

Doing the rounds on a few websites..

Without using a calculator what would be the answer to the above equation? 2 or 288?
Old 08 April 2011, 04:23 PM
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Ant
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288
Old 08 April 2011, 04:23 PM
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what would scooby do
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288 if you are making the assumption that it is actually 2*(9+3)

Have this:

Your power comes from an ability to sense how things might be and to proclaim this possibility with a great force and willingness to act. You have a tendency to be romantic, and can be an idealist. This sense of how the world can be is often expressed with self-deprecatory humor. Because of your need to address the immediacy of the moment, you may not think things through to their logical end, relying instead on a feeling for how a situation SHOULD end. You need to be liked and appreciated by others, although your attention often wanders. Sometimes you neglect old friends in favor of a new or exciting acquaintance. You have a real difficulty being alone. Often you will seem to know how to handle a situation without exactly knowing HOW you know this. Your thoughts are often shallow. While in the excitement of the moment you can obsess about a task at hand. If it should become rote and unexciting, however, it can be dropped just as quickly.
Old 08 April 2011, 04:24 PM
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I always thought you did what was in brackets first, therefore it's 288.
Old 08 April 2011, 04:30 PM
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Originally Posted by Clarebabes
I always thought you did what was in brackets first, therefore it's 288.

That's correct.

That breaks down to 48 ÷ 2 x 12.

Each operation in the above has the same strength, so you work from left to right
Old 08 April 2011, 04:32 PM
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CREWJ
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It's 2.

You work out the brackets first.

You don't work from left to right because there is no multiple sign there.
Old 08 April 2011, 04:32 PM
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Iain Young
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Oops, clicked the wrong vote button. It should be 288.

(48/2) * (2 * (9+3))
24 * (2 * 12)
24 * 24
288

Type this into any programming language (Java, COBOL, c# etc) and you'll get the same result.

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Old 08 April 2011, 04:33 PM
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Originally Posted by CREWJ
It's 2.

You work out the brackets first.

48 / 2 * (9+3)

48 / (2*12)

48 / 24

2

Why did you add the 2 x 12 into brackets that aren't there?
Old 08 April 2011, 04:33 PM
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2
Old 08 April 2011, 04:33 PM
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CREWJ
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You don't work from left to right because there is no multiple sign there.

The point of removing the multiple sign is to eliminate the use of too many brackets.

Last edited by CREWJ; 08 April 2011 at 04:35 PM.
Old 08 April 2011, 04:35 PM
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Originally Posted by Iain Young
Oops, clicked the wrong vote button. It should be 288.

(48/2) * (2 * (9+3))
24 * (2 * 12)
24 * 24
288

Type this into any programming language (Java, COBOL, c# etc) and you'll get the same result.
Iain - you're wildly adding a 2 there

24 x 24 = 576
Old 08 April 2011, 04:36 PM
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If you put the sum into google search bar the answer comes back instead of the suggested sites



Last edited by what would scooby do; 08 April 2011 at 04:38 PM.
Old 08 April 2011, 04:38 PM
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Wow Google adds more brackets and adds another sign in there. Good times.
Old 08 April 2011, 04:38 PM
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BODMAS. (Brackets over division, multiplication, addition, subtraction,)

Work out the brackets first, do the division 2nd and then the multiplication 3rd, Simples.

Last edited by LEO-RS; 08 April 2011 at 04:41 PM.
Old 08 April 2011, 04:41 PM
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Originally Posted by Kieran_Burns
Iain - you're wildly adding a 2 there

24 x 24 = 576
Knickers. It's Friday afternoon. Best stop coding lest I do any real damage
Old 08 April 2011, 04:41 PM
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Originally Posted by CREWJ
It's 2.

You work out the brackets first.

You don't work from left to right because there is no multiple sign there.
you're only a 1/3 right

There is a multiply sign there: the 2 in front of the brackets MEANS multiply by. The multiply operation carrys the same strength as the ÷ so you read the equation from left to right to get the answer when you have equal strength operations.

The brackets simply show that you need to complete the section inside the bracket first.
Old 08 April 2011, 04:43 PM
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Originally Posted by Iain Young
Knickers. It's Friday afternoon. Best stop coding lest I do any real damage

You weren't on the Mars Climate Orbiter project were you?
Old 08 April 2011, 04:44 PM
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It's this surely.

Old 08 April 2011, 04:45 PM
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no it's..

(48/2)(9+3)
Old 08 April 2011, 04:46 PM
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Originally Posted by alloy
no it's..

(48/2)(9+3)
But that's not what's written.
Old 08 April 2011, 04:49 PM
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the notation is ambiguous, but you are wrong
Old 08 April 2011, 04:51 PM
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Originally Posted by CREWJ
It's this surely.


No, you're giving the divide operation greater strength than the multiply, and don't call me Shirley
Old 08 April 2011, 04:53 PM
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As Leo-RS implies, the question here is whether or not you understand operator precedence when it is not clearly defined. Things in brackets take the highest precedence, then division, then multiplication, then addition, then subtraction.

So in the case in question, where the precedence isn't clear, you should remember BODMAS! Or tell the person who wrote it they are a tool and to use brackets more clearly.
Old 08 April 2011, 04:54 PM
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If you wanted that then you shouldn't have grouped the 2 with the (9+3). Grouping it together means nothing in terms of strength just that it's a common entity.
Old 08 April 2011, 04:55 PM
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Originally Posted by LEO-RS
BODMAS. (Brackets over division, multiplication, addition, subtraction,)

Work out the brackets first, do the division 2nd and then the multiplication 3rd, Simples.
As above.
Old 08 April 2011, 05:03 PM
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BODMAS

+1
Old 08 April 2011, 05:28 PM
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Its 2, simple, think most of you should go back to school.
Old 08 April 2011, 05:46 PM
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BODMAS.

+2
Old 08 April 2011, 05:50 PM
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This is why the quants at the banks got us into so much trouble

Some said 2, some said 288. 288 made more profit so they went with that
Old 08 April 2011, 05:53 PM
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Smile

Originally Posted by Trout
This is why the quants at the banks got us into so much trouble

Some said 2, some said 288. 288 made more profit so they went with that

LOVE IT


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