Anybody fancy doing a puzzle???

[Florge]

You guys are obviously too good at the basic maths puzzles. Hope this one will keep you busy for a bit longer.

Here is the problem.

•You are in a room with 10 cases, each containing 20 metal bars.
•Nine of the cases contain bars of worthless base metal that looks like gold and one case contains bars of solid gold.
•You know that each bar of base metal weighs exactly 1 pound and each gold bar weighs one pound and one ounce.
•There is an electronic scale in the room, but it can only be used once and will flash the weight for only 5 seconds.
•You have no other equipment.
•You may leave the room with one case, which is yours to keep.
•How do you pick the right case?

Remember, you are looking for a mathematical solution so no questions please about whether the bars are painted, or feel different, or if there is a way to use the scales more than once, etc.

Good luck.

Mr P&P

NOSEBLEED!!!! lol... i'm soooo glad I took Comm Arts.. less Math (just Algebra and Trigo) and no Calculus (thank God!)

[Jay&Zobel]

As far as I can remember teacher from Kindergarten, Primary, Secondary, and Intermediate they always emphasize that in Math specially in solving problems the answer must be in ORDER and it's proper place. It's not in scramble order. So, I think there is one simple RULE in Math all the answers it MUST be in order all the time. Because if not, your answer will be wrong. Formula is a formula, and you can never scramble your answer or else everything is wrong.

Definitely agree with you!!

NOSEBLEED!!!! lol... i'm soooo glad I took Comm Arts.. less Math (just Algebra and Trigo) and no Calculus (thank God!)

Hehehe... NOSEBLEEEEEEDDDD NGA HEHEHE... sino kaya Math genius dito to answer that?

[Alan]

OK - as a maths teacher myself, I have read this thread with much interest.

Please allow me these comments - and these are my personal opinions based on experience - so, I am not saying that the following comments are 'globally acceptable' ones.

Firstly, mathematics is the ONLY purely LOGICAL science in the world. Even physics has a 'what if' syndrome to it - for example - 'what if we could travel in time?'

Secondly, the whole 'language' of mathematics revolves around the manipulation of JUST 10 DIGITS!!! How easy can that be??

Thirdly, children, adolescents and adults are 'afraid' of mathematics simply because of the way they have been taught!!! I once heard at a conference the epithet: 'There are an awful lot of maths teachers out there, and there are a lot of awful maths teachers out there.'

The above, in my opinion, is SOOOO true!!!! I have seen teachers, when I have been observing, who have made me cringe when they try to explain mathematical concepts to students!!!!!

Fourthly, to relate to comments made on this thread, please believe me on this - 'YOU MUST DO MATHS IN THE RIGHT ORDER OTHERWISE IT WILL BE WRONG' NO - I'm sorry, this is not correct! Comments like this (remember, in my opinion,) eminate from BAD maths teachers. Mathematics is not about the 'what' - it is about the 'HOW!'
When you understand HOW things work in mathematics, it does not matter in what order you calculate - IN FACT - if you understand the 'how' you have more or less done the calculation anyway.

I admit that, however, ONLY SOME of the time, the order is important - but only in a 'logical'sense.

Perhaps I am confusing some of you here. It would, of course, take me infinitely longer than this small post to fully expound my comments - I LOVE teaching mathematics, because it allows me to show people how badly they have been taught in the past - and consequently why they 'fear' mathematics.

Please don't misunderstand this post. I am NOT saying that I know all the answers or that I am a brilliant maths teacher. I am simply saying that I believe that a lot of so-called maths teachers have a lot to answer for - for assuming that their students know what the hell they are talking about.

ANY TEACHER in ANY SUBJECT must consider the student first and foremost. Sadly, this is not the truth!!

Al.

[Jay&Zobel]

OK - as a maths teacher myself, I have read this thread with much interest.

Please allow me these comments - and these are my personal opinions based on experience - so, I am not saying that the following comments are 'globally acceptable' ones.

Fourthly, to relate to comments made on this thread, please believe me on this - 'YOU MUST DO MATHS IN THE RIGHT ORDER OTHERWISE IT WILL BE WRONG' NO - I'm sorry, this is not correct! Comments like this (remember, in my opinion,) eminate from BAD maths teachers. Mathematics is not about the 'what' - it is about the 'HOW!'
When you understand HOW things work in mathematics, it does not matter in what order you calculate - IN FACT - if you understand the 'how' you have more or less done the calculation anyway.

I admit that, however, ONLY SOME of the time, the order is important - but only in a 'logical'sense.


Al.

Hi Sir:

Think you mind find this interesting:
http://www.mathgoodies.com/lessons/v...perations.html
Based from the problem that:
"It seems that each student interpreted the problem differently, resulting in two different answers.
Student 1 performed the operation of addition first, then multiplication; whereas
student 2 performed multiplication first, then addition.

When performing arithmetic operations there can be only one correct answer. We need a set of rules in order to avoid this kind of confusion. Mathematicians have devised a standard order of operations for calculations involving more than one arithmetic operation."

---------

Therefore, if not properly done and rules were not followed, there will be different answers given to a problem.


Also it has been said that:
"Mathematics is the exact science of mathematical reasoning and related aspects of mathematical practice.

Math has the advantage of being irrefutable."

[Alan]

Exactly!!!!

When you present the student with:

3 + 4 x 2

the student must know the HOW!!!

And knowing the how, the student will say 3 + 8 - OR 8 + 3.

The confusion here stems from the PRESENTATION of the problem - an unnecessary stupefication of logicality.

Al.

[pennybarry]

So much of diverting the topic Ms Penny. I'm looking forward to your answer to post # 30. You're really good in Math, no doubt about it you got 95!!!....

Cheers!

Lol! Sounds like you're insulting me everytime you mentioned my 95 grade in Math. It's also sounds you're forcing me to answer that #30. What will gonna happen if I will not answer that question? How if I answered it right?

Can I just say I can't answer this questions to make other girls happy and have harmonous in this thread? I don't want to see black letters turn into RED ehehhehe. That means angry?

http://filipinaroses.com/showthread.php?t=16015&page=3 post#80

Or it is much better to challenge all accountants here to show our transcript of Records and result of Certified Public Accountant Board Exam?

Anyway I'm almost late with my work so I'll answer it even not yet complete . Making money is more important to me.


If you have 10 cases/box, put letters to boxes/cases - Box A Box B Box C... Box J or any mark that will suits you so you will not be confused

Take bars from each box (box a to Box J)

You can put all together in a scale and get the measurement and deduct the all the 1 pd 1 ounce (Gold weight). It will give you an answer.

To be continued

[I][B]
Even if your Math teacher won't tell you that answers should be in order it must be. SHOULD BE IN ORDER ALL THE TIME. You should know that as you got 95 in Math. I am not that good...
So i made "double checking" on your answers.... and noticed it was interchanged...

Sorry, I cannot believe you on this. Would rather believe now with more highly professional.

OK
Fourthly, to relate to comments made on this thread, please believe me on this - 'YOU MUST DO MATHS IN THE RIGHT ORDER OTHERWISE IT WILL BE WRONG' NO - I'm sorry, this is not correct! Comments like this (remember, in my opinion,) eminate from BAD maths teachers. Mathematics is not about the 'what' - it is about the 'HOW!'
When you understand HOW things work in mathematics, it does not matter in what order you calculate - IN FACT - if you understand the 'how' you have more or less done the calculation anyway.

Al.

I agree with your opinion Sir because when I answered that math question, It's just like find the missing numbers for me. So I put the missing numbers in it's place.

But to make other girls happy, I will accept my answer was wrong although it was not explained how my answer became wrong in my own satisfaction.

[Florge]

http://filipinaroses.com/showthread.php?t=16015&page=3 post#80

Oh.. this is my post!!! hehehe... thanks for quoting it... glad to know this was noticed...

[Mrs.JMajor]

Anyway I'm almost late with my work so I'll answer it even not yet complete . Making money is more important to me.


If you have 10 cases/box, put letters to boxes/cases - Box A Box B Box C... Box J or any mark that will suits you so you will not be confused

Take bars from each box (box a to Box J)

You can put all together in a scale and get the measurement and deduct the all the 1 pd 1 ounce (Gold weight). It will give you an answer.

To be continued

Are you not gonna bring your husband also to help you answer the question friendship

I am not good in math, but my business is always adding % in capital