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Thread: 2009 Maths Question which Adult also duno!

  1. #1
    Senior Member melvin's Avatar
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    Default 2009 Maths Question which Adult also duno!

    This year PSLE!

    From Yahoo Sg:

    Jim bought some chocolates and gave half of it to Ken. Ken bought some sweets and gave half of it to Jim. Jim ate 12 sweets and Ken ate 18 chocolates. The ratio of Jim’s sweets to chocolates became 1:7 and the ratio of Ken’s sweets to chocolates became 1:4. How many sweets did Ken buy?"




    Anyone? Me still trying!
    Last edited by melvin; 20th October 2009 at 05:49 PM.

  2. #2
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    Default Re: 2009 Maths Question which Adult also duno!

    these "problem sums" are not math problems. they are testing language ability.
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    Default Re: 2009 Maths Question which Adult also duno!

    simple simultaneous equation.

    assume jim buys c chocolates, ken buys s sweets.

    at the end, jim will have c/2 chocolates, ken will have c/2 - 18 chocolates
    at the end, jim will have s/2 -12 sweets, ken will have s/2 sweets

    c/2 = 7(s/2 - 12) = 7s/2 - 84 --- (1)
    c/2 - 18 = 4(s/2) = 2s --- (2)

    from (2): c/2 = 2s + 18 --- (3)

    sub (3) into (1)

    2s + 18 = 7s/2 - 84
    so 102 = 3/2 s

    s = 68
    c = 308

    checked the answer is correct;

    jim has 154 chocolates, ken has 154- 18 = 136 chocolates
    ken will have 34 sweets, jim will have 22 sweets

    154/22 = 7
    136/34 = 4

    QED
    Last edited by night86mare; 20th October 2009 at 05:57 PM.

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    Default Re: 2009 Maths Question which Adult also duno!

    isn't this the maths question from the PSLE everybody was complaining about...

    i replace the choc and sweet with X and Y then from there form equations... thats how i do it, or maybe there is a easier way i dunno... anyway these questions are more towards Sec sch standard...

    i think i better start to prepare myself in the future, wait my kid ask me i dunno...
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  5. #5
    Senior Member melvin's Avatar
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    Default Re: 2009 Maths Question which Adult also duno!

    Quote Originally Posted by night86mare View Post
    simple simultaneous equation.

    assume jim buys c chocolates, ken buys s sweets.

    at the end, jim will have c/2 chocolates, ken will have c/2 - 18 chocolates
    at the end, jim will have s/2 -12 sweets, ken will have s/2 sweets

    c/2 = 7(s/2 - 12) = 7s/2 - 84 --- (1)
    c/2 - 18 = 4(s/2) = 2s --- (2)

    from (2): c/2 = 2s + 18 --- (3)

    sub (3) into (1)

    2s + 18 = 7s/2 - 84
    so 102 = 3/2 s

    s = 68
    c = 308

    checked the answer is correct;

    jim has 154 chocolates, ken has 154- 18 = 136 chocolates
    ken will have 34 sweets, jim will have 22 sweets

    154/22 = 7
    136/34 = 4

    QED

    What if the kid duno simultaneous equation? sure they are not taught simultaneous equation in P6? Any other easier way?

  6. #6

    Default Re: 2009 Maths Question which Adult also duno!

    Quote Originally Posted by antacid View Post
    these "problem sums" are not math problems. they are testing language ability.
    Fully agree with you. Wonder MOE is testing lang or maths...kekeke. I've problem with P4 maths
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    Default Re: 2009 Maths Question which Adult also duno!

    Quote Originally Posted by melvin View Post
    What if the kid duno simultaneous equation? sure they are not taught simultaneous equation in P6? Any other easier way?
    use model drawing.

    it is just a stupid way of doing simultaneous equations algebra.. but it works too.

    that's what we had to do in pri 6..

    anyways, the main issue is not getting out the answer, the main issue is that the calculations are so tedious, easy to make mistake. they allowed to use calculators?

    i've seen some recent pri 6 school papers, they are loaded with this type of questions, it really shouldn't be an issue as to doing it, rather about making mistake. i don't know their syllabus though.. but i'm sure if so many papers had it, it was taught in some way.

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    Senior Member melvin's Avatar
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    Default Re: 2009 Maths Question which Adult also duno!

    Quote Originally Posted by flowerpot View Post
    isn't this the maths question from the PSLE everybody was complaining about...

    i replace the choc and sweet with X and Y then from there form equations... thats how i do it, or maybe there is a easier way i dunno... anyway these questions are more towards Sec sch standard...

    i think i better start to prepare myself in the future, wait my kid ask me i dunno...
    Nowadays it is rather common for parents to duno how to do their children school work! Like my friend (dipolma) cant even score 100% of her son's P6 Maths!

    Standard high high!
    Last edited by melvin; 20th October 2009 at 06:14 PM.

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    Default Re: 2009 Maths Question which Adult also duno!

    Quote Originally Posted by night86mare View Post
    simple simultaneous equation.

    assume jim buys c chocolates, ken buys s sweets.

    at the end, jim will have c/2 chocolates, ken will have c/2 - 18 chocolates
    at the end, jim will have s/2 -12 sweets, ken will have s/2 sweets

    c/2 = 7(s/2 - 12) = 7s/2 - 84 --- (1)
    c/2 - 18 = 4(s/2) = 2s --- (2)

    from (2): c/2 = 2s + 18 --- (3)

    sub (3) into (1)

    2s + 18 = 7s/2 - 84
    so 102 = 3/2 s

    s = 68
    c = 308

    checked the answer is correct;

    jim has 154 chocolates, ken has 154- 18 = 136 chocolates
    ken will have 34 sweets, jim will have 22 sweets

    154/22 = 7
    136/34 = 4

    QED
    the smart ones will skip this question.

  10. #10
    Senior Member melvin's Avatar
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    Default Re: 2009 Maths Question which Adult also duno!

    Quote Originally Posted by Jer View Post
    Fully agree with you. Wonder MOE is testing lang or maths...kekeke. I've problem with P4 maths
    To me they are trying to differentiate who the Elites are or rather sperate the Elites from the normal students!

  11. #11

    Default Re: 2009 Maths Question which Adult also duno!

    Quote Originally Posted by kiwitan View Post
    the smart ones will skip this question.


    yeah, i think so too. maybe do it last. i made a mistake when i did it the first time, came up with decimals.

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    Default Re: 2009 Maths Question which Adult also duno!

    Quote Originally Posted by melvin View Post
    To me they are trying to differentiate who the Elites are or rather sperate the Elites from the normal students!
    They are trying to differentiate those who studied sec school stuff while in primary school.
    Personally this does not really mean those who can answer the questoin are elite.
    I recall in my class, those 'smart kids' who studied ahead did well in primary & secondary school, then most of them fast the harsh reality that they are just the same or even not as good as their peers when they are in tertiary level and at work.

  13. #13

    Default Re: 2009 Maths Question which Adult also duno!

    Algebra solution is not taught in primary school but need to use model and it's tedious. Only way is to teach them algebra on your own and then tell them to provide model ( table )answers after they find the answer through algebra. Still the child understand the model concept but answer the question in shorter time.

  14. #14

    Default Re: 2009 Maths Question which Adult also duno!

    gosh.....

    now i know why the aunties in my office are making a big fuss out of this.

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    Talking Re: 2009 Maths Question which Adult also duno!

    Under ©onstruction!

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    Default Re: 2009 Maths Question which Adult also duno!

    think need to use ratio to solve...

  17. #17
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    Default Re: 2009 Maths Question which Adult also duno!

    Model method will do, I think ...

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    Default Re: 2009 Maths Question which Adult also duno!

    Honestly, I don't see what the big hoohah is about the exams. If it's really difficult, then results will just fall across the cohort. It's not as if there is any unfairness in the exams ( like some people have an advantage). Maybe it's just parents who are feeling embarassed because they can't do the questions.

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    Default Re: 2009 Maths Question which Adult also duno!

    Quote Originally Posted by kiwitan View Post
    the smart ones will skip this question.
    Actually, you have a point, if this is really the hardest question in the paper, skimpily doing it for a few 'working marks' and answering the rest will still earn you a A grade.

    I wonder if these qns are really representative of the entire paper's difficulty


    P.S- I find it kinda dumb that algebra isn't allowed in the PSLE though

  20. #20

    Default Re: 2009 Maths Question which Adult also duno!

    we found this solution for our son:
    http://www.sakamoto.net/web.php?pg=6&type=article

    check on the 8 oct 2009 link, u will find the answer there.

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