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48/2(9+3) = ?

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CissNei
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  #1 Old 17-04-2011 Default 48/2(9+3) = ?

Came across this in a few forums! 288?

EDIT:
Turned out that the title didnt post properly, it should've been (Division sign, in this case not "/")

48 "Division sign" 2(9+3) = ?

Last edited by CissNei; 17-04-2011 at 08:24 PM.
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  #2 Old 17-04-2011 Default Re: 48?2(9+3) = ?

48 / 2(9+3)
= 48 / 2(12)
= 48 / 24
= 2

hope i am right
looks logical to me.
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  #3 Old 17-04-2011 Default Re: 48?2(9+3) = ?

maybe its 48/2 x (9+3)?
= 24 x 12
= 288
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  #4 Old 17-04-2011 Default Re: 48?2(9+3) = ?

Quote:
Originally Posted by Chelsea View Post
48 / 2(9+3)
= 48 / 2(12)
= 48 / 24
= 2

hope i am right
looks logical to me.
Quote:
Originally Posted by nickvl View Post
maybe its 48/2 x (9+3)?
= 24 x 12
= 288
The answer is 288. Not 2. Here is the explanation:

When you do a mathematical operation like this, the law is to solve whatever is in the bracket first. Once that part is solved, the operation proceeds from left to right as usual, with multiplications and divisions taking priority first before considering additions and subtractions. In this case:

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

48/2(12) is simply not the same as 48/[2(12)]. The former will give 288, the latter yields 2.

The point is: do not add brackets or parentheses unnecessarily. Sometimes you might just be making an error when you put a set of extra brackets, or imagine that there is one.
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  #5 Old 17-04-2011 Default Re: 48/2(9+3) = ?

Quote:
Originally Posted by CissNei View Post
Came across this in a few forums! 288?

EDIT:
Turned out that the title didnt post properly, it should've been (Division sign, in this case not "/")

48 "Division sign" 2(9+3) = ?
In computer typography usually the slash (/) is used in the same context as the division sign.

Quote:
Originally Posted by Chelsea View Post
48 / 2(9+3)
= 48 / 2(12)
= 48 / 24
= 2

hope i am right
looks logical to me.
Quote:
Originally Posted by nickvl View Post
maybe its 48/2 x (9+3)?
= 24 x 12
= 288
If we were to interpret 48/2(9+3) in a casual context, we would be quite tempted to see the 2(9+3) part as a group because 2(9+3) is more seen as "nine plus three doubled" instead of two, times, the sum of nine plus three. So in some ways our mind automatically added brackets around the whole (2(9+3)) even though it wasn't specified in the original phrase.

In strict computation though, we have to obey what is often summarised as the "BODMAS" order in English (Brackets, Other, Division, Multiplication, Addition, Subtraction) - note that Division and Multiplication are on the same tier, so are addition and subtraction. In this case, we should do the addition inside the brackets (which gives us 12), then division of 48/2 (24), and then multiply by 12.
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Last edited by youngyew; 17-04-2011 at 09:57 PM.
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  #6 Old 17-04-2011 Default Re: 48/2(9+3) = ?

yup, i think henry yew is right. i made an error when applying the BODMAS rule when expanding the equation. thanks.
and one question. this symbol [ ] is it called parentheses. noticed that you used it.
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  #7 Old 17-04-2011 Default Re: 48/2(9+3) = ?

Quote:
Originally Posted by youngyew View Post
In strict computation though, we have to obey what is often summarised as the "BODMAS" order in English (Brackets, Other, Division, Multiplication, Addition, Subtraction) - note that Division and Multiplication are on the same tier, so are addition and subtraction. In this case, we should do the addition inside the brackets (which gives us 12), then division of 48/2 (24), then do the 24 * 2, and then multiply by 12.
Tak faham, boss. We should do addition inside the brackets (which gives us 12). OK! Faham. Then division of 48/2, which gives 24. OK! Faham also. Do the 24 * 2? Tak faham lah!
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  #8 Old 17-04-2011 Default Re: 48/2(9+3) = ?

Quote:
Originally Posted by henry_yew View Post
Tak faham, boss. We should do addition inside the brackets (which gives us 12). OK! Faham. Then division of 48/2, which gives 24. OK! Faham also. Do the 24 * 2? Tak faham lah!
Sorry I must be half asleep. Corrected it
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  #9 Old 19-04-2011 Default Re: 48/2(9+3) = ?

1/2X where X = 2?
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  #10 Old 19-04-2011 Default Re: 48/2(9+3) = ?

Huh what are you referring to CissNei?
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