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48÷2(9+3)

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Ricky116
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2011/04/08 00:15:15 (permalink)
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48÷2(9+3)

What is the answer?
 
Got this equation from another board (you can probably guess which one ) and its solution is kicking up quite the debate. 48÷2(9+3) wadda ya reckon?
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    AWG
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    Re:48÷2(9+3) 2011/04/08 00:17:33 (permalink)
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    aware
     
    36?
     
    #2
    john_cappa
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    Re:48÷2(9+3) 2011/04/08 00:17:55 (permalink)
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    2
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    FatboyGinger
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    Re:48÷2(9+3) 2011/04/08 00:22:36 (permalink)
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    BIDMAS :)

    "Facts are meaningless. You could use facts to prove anything that's even remotely true."
    #4
    master plan
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    Re:48÷2(9+3) 2011/04/08 00:25:23 (permalink)
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    288.
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    jnr2006
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    Re:48÷2(9+3) 2011/04/08 00:26:18 (permalink)
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    2??
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    Ricky116
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    Re:48÷2(9+3) 2011/04/08 00:26:27 (permalink)
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    I at first said 2 as well.
     
    But then I came to my senses. Gotta be 288! Work through it using BIDMAS (I call it BODMAS actually) fatboy, and don't make up no imaginary brackets!
    #7
    rogerthedog
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    Re:48÷2(9+3) 2011/04/08 00:34:46 (permalink)
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    I need more coffee. It needs more parentheses!
    post edited by rogerthedog - 2011/04/08 00:36:37
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    jack5r
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    Re:48÷2(9+3) 2011/04/08 00:40:47 (permalink)
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    2. How you getting 288

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    #9
    Osagi
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    Re:48÷2(9+3) 2011/04/08 00:40:54 (permalink)
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    48 / 2 * (9 + 3)
    48 / 2 * 12
    (48 / 2) * 12
    24 * 12
    = 288
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    master plan
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    Re:48÷2(9+3) 2011/04/08 00:41:57 (permalink)
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    Like Osagi has said.
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    jack5r
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    Re:48÷2(9+3) 2011/04/08 00:44:59 (permalink)
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    Why are you adding before you have expanded the brackets.
    post edited by jack5r - 2011/04/08 00:47:07

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    #12
    john_cappa
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    Re:48÷2(9+3) 2011/04/08 00:45:17 (permalink)
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    i still think its 2! The 2(9+3) operates as a seperate thingamajig and the bidmas applies to it on its own first. Thats how i would interpret it anway.!
    post edited by john_cappa - 2011/04/08 00:51:43
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    Re:48÷2(9+3) 2011/04/08 00:48:50 (permalink)
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    jack5r

    Why are you adding before you have expanded the brackets.

     
    48÷(2(9+3))= 2.
    #14
    jack5r
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    Re:48÷2(9+3) 2011/04/08 00:51:41 (permalink)
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    Did A level maths and never saw an equation like that.

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    john_cappa
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    Re:48÷2(9+3) 2011/04/08 00:54:09 (permalink)
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    got a1 in leaving cert math and a's or b's in 5 engineering maths modules......got that wrong though lol! Algebra online solver says 288!
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    jack5r
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    Re:48÷2(9+3) 2011/04/08 00:59:17 (permalink)
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    As above lol... Would it still be worked out as osagi has said If there was an x involved? 48 / 2x(9+3)
    post edited by jack5r - 2011/04/08 01:00:51

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    #17
    FatboyGinger
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    Re:48÷2(9+3) 2011/04/08 01:01:38 (permalink)
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    The way I see it
    48/ 2(9+3)
    48/ (18 +2(3))
    48/  (18+6)
      =2
    For example, it it were 48/ p(f+q) the first thing you would do is expand the brackets, getting 48/ pf +pq.
    Same in this circumstance IMO.
    Interesting one actually, I'm at Uni doing a maths related course and I'm not 100% lol

    "Facts are meaningless. You could use facts to prove anything that's even remotely true."
    #18
    jack5r
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    Re:48÷2(9+3) 2011/04/08 01:07:54 (permalink)
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    That is what i thought. I guess as you are not trying to find a value for a given letter it is more strate forward. Funny how more complex maths makes simple maths harder.

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    #19
    SecondRow
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    Re:48÷2(9+3) 2011/04/08 01:15:21 (permalink)
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    the answer is 288. As a maths graduate working in a quantitative finance role I can tell you that is categorically the answer. I can also tell you that no-one would ever write it like that, but the key is in the fact that division and multiplication are on the same level of execution; when you have two actions on the same level of execution, you ALWAYS work from left to right, hence:

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

    Jack5r, you would always do the addition first, as anything inside parentheses has top priority. The 2 is outside the parentheses, therefore the multiplication does not share this privilege.

    For the answer to be 2 it would need to be written as

    48/(2(9+3)).

    End of debate!

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