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InvisibleOrgoneConclusion
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Re: mathematical brain teaser thread [Re: DividedQuantum]
    #21870323 - 06/28/15 08:05 PM (8 years, 6 months ago)

Quote:

Kant did not reset the hands because his watch was being repaired




If it was undergoing repair, how was Kant in possession of it and how was it suddenly functional?

Try to make sense! :mad:


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Offlinedeff
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Re: mathematical brain teaser thread [Re: OrgoneConclusion]
    #21870348 - 06/28/15 08:11 PM (8 years, 6 months ago)

i took that to mean he had a clock and a watch. the clock had stopped at the wrong time, and he didn't have his watch due to it being repaired, otherwise he could have corrected the clock - that's how i read it anyways :smile:


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Offlinesecondorder
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Re: mathematical brain teaser thread [Re: deff]
    #21870693 - 06/28/15 09:31 PM (8 years, 6 months ago)

Quote:

A windowless room contains three identical light fixtures, each containing an identical light bulb or light globe. Each light is connected to one of three switches outside of the room. Each bulb is switched off at present. You are outside the room, and the door is closed. You have one , and only one, opportunity to flip any of the external switches. After this, you can go into the room and look at the lights, but you may not touch the switches again. How can you tell which switch goes to which light?




Do you turn one switch on, wait a while, then turn another on and immediately enter the room, at which time you feel which light bulb is the hottest (this is the one you turned on first), which one is less warm, but still on (this is the second one you turned on) and which one is off (this is the one you did not switch on).


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InvisibleSun King
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Re: mathematical brain teaser thread [Re: secondorder]
    #21872051 - 06/29/15 05:55 AM (8 years, 6 months ago)

Quote:

secondorder said:
Quote:

A windowless room contains three identical light fixtures, each containing an identical light bulb or light globe. Each light is connected to one of three switches outside of the room. Each bulb is switched off at present. You are outside the room, and the door is closed. You have one , and only one, opportunity to flip any of the external switches. After this, you can go into the room and look at the lights, but you may not touch the switches again. How can you tell which switch goes to which light?




Do you turn one switch on, wait a while, then turn another on and immediately enter the room, at which time you feel which light bulb is the hottest (this is the one you turned on first), which one is less warm, but still on (this is the second one you turned on) and which one is off (this is the one you did not switch on).




:innocentjoy:

The consensus of opinion seems to be either these is equally correct:

    Switch on switches 1 & 2, wait a minute and switch off number 2.

    Enter the room. Whichever bulb is on is wired to switch 1, whichever is off and hot is wired to switch number 2, and the third is wired to switch 3.

OR this:

    Switch on switch number 1, wait a few minutes and switch on switch number 2.

    Enter the room and which ever bulb is on and is hot is connected to switch 1, whichever is on and cold is connected to switch number 2, and the remaining bulb is connected to switch number 3.

Either solution is logically equally valid. The first may be more practical.


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InvisibleDividedQuantumM
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Re: mathematical brain teaser thread [Re: DividedQuantum]
    #21882403 - 07/01/15 10:51 AM (8 years, 6 months ago)

Once again, Problem 12:


Quote:


Insert mathematical signs anywhere between the digits

1, 2, 3, 4, 5, 6, 7, 8, 9

to make the expression equal 100.

Please provide two solutions.





Anyone?


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InvisibleSun King
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Re: mathematical brain teaser thread [Re: DividedQuantum]
    #21882604 - 07/01/15 11:41 AM (8 years, 6 months ago)

I found 11 solutions on google.


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InvisibleDividedQuantumM
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Re: mathematical brain teaser thread [Re: Sun King]
    #21882672 - 07/01/15 12:07 PM (8 years, 6 months ago)

:lol:

So it can be done.


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InvisiblecowsRmeat
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Re: mathematical brain teaser thread [Re: DividedQuantum]
    #21882933 - 07/01/15 01:36 PM (8 years, 6 months ago)

Quote:

DividedQuantum said:
Once again, Problem 12:


Quote:


Insert mathematical signs anywhere between the digits

1, 2, 3, 4, 5, 6, 7, 8, 9

to make the expression equal 100.

Please provide two solutions.





Anyone?





:philososloth:


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One day Alice came to a fork in the road and saw a Cheshire cat in a tree.
'Which road do I take?' she asked.
'Where do you want to go?' was his response.
'I don't know', Alice answered.
'Then', said the cat, 'it doesn't matter.'





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InvisibleDisoRDeR
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Re: mathematical brain teaser thread [Re: DividedQuantum] * 1
    #21883002 - 07/01/15 01:58 PM (8 years, 6 months ago)

1 - 2 - 3 - 4 + 5! + 6 - 7 - 8 - √9 = 100


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InvisibleDividedQuantumM
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Re: mathematical brain teaser thread [Re: DisoRDeR]
    #21883040 - 07/01/15 02:07 PM (8 years, 6 months ago)

:mushroom2::mushroom2::mushroom2:

I will definitely accept that.

:thumbup:


Anyone else?


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InvisibleDisoRDeR
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Re: mathematical brain teaser thread [Re: DividedQuantum]
    #21883198 - 07/01/15 02:52 PM (8 years, 6 months ago)

Aww -- I was trying to break the game :ohsodevious:


How about  -1 + 23 + d456/dx + 78 +d9/dx


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InvisibleDividedQuantumM
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Re: mathematical brain teaser thread [Re: DisoRDeR]
    #21883589 - 07/01/15 04:10 PM (8 years, 6 months ago)

Lol yeah well the standard solutions only use basic symbols, but I figured a factorial and a square root weren't so out of line, and it was the only answer I've gotten and it was correct enough.

This latest answer is definitely out there, though.


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InvisibleSun King
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Re: mathematical brain teaser thread [Re: DividedQuantum] * 1
    #21883667 - 07/01/15 04:26 PM (8 years, 6 months ago)

1+2+3+4+5+6+7+(8*9)


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InvisibleDividedQuantumM
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Re: mathematical brain teaser thread [Re: Sun King]
    #21883698 - 07/01/15 04:34 PM (8 years, 6 months ago)

Quote:

Sun King said:
1+2+3+4+5+6+7+(8*9)




Completely correct.  A second solution would be 123 - 45 - 67 + 89 = 100.

One can google many others, as well.  Sun King pointed out correctly that, using only simple symbols (i.e. not factorials or square roots), there are at least eleven solutions.


More problems to follow.  :smile:


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InvisibleSun King
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Re: mathematical brain teaser thread [Re: Sun King]
    #21883792 - 07/01/15 04:59 PM (8 years, 6 months ago)

1+2^3-4+(5*6)+(7*8)+9


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OfflineAnahata


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Re: mathematical brain teaser thread [Re: DividedQuantum]
    #21899145 - 07/04/15 11:41 PM (8 years, 6 months ago)

Genetics caused them to be different, which is not that uncommon, and they were delivered minuets apart.


Or a funner idea, two couples which were both male and female twins had kids on the same day, thus different girls. (ie) 2 twins guys married two twin women.

edited for poster


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Edited by Anahata (07/04/15 11:41 PM)


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InvisibleDividedQuantumM
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Re: mathematical brain teaser thread [Re: DividedQuantum]
    #21934930 - 07/12/15 08:08 PM (8 years, 6 months ago)

PROBLEM #13

Quote:


If you happen to meet two of the Jones sisters (this assumes that the two are random selections from the set of all the Jones sisters), it is an exactly even-money bet that both girls will be blue eyed.  What is your best guess as to the total number of blue-eyed Jones sisters?





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Offlinesecondorder
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Re: mathematical brain teaser thread [Re: DividedQuantum] * 1
    #21935450 - 07/12/15 10:37 PM (8 years, 6 months ago)

Three?

Three blue eyed, and one not blue eyed.

You'd have a 75% chance of meeting a blue eyed Jones sister if you just met one of them.
If you were to then meet another Jones sister, you'd have a 66% chance of meeting one of the remaining two blue eyed sisters.

Two thirds of three quarters is one half: 50% chance.


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InvisibleDividedQuantumM
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Re: mathematical brain teaser thread [Re: secondorder]
    #21936208 - 07/13/15 07:14 AM (8 years, 6 months ago)

:mushroom2::mushroom2::mushroom2:


Correct!


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InvisibleDividedQuantumM
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Re: mathematical brain teaser thread [Re: DividedQuantum]
    #21936211 - 07/13/15 07:18 AM (8 years, 6 months ago)

PROBLEM #14


Quote:

An absent-minded bank teller switched the dollars and cents when he cashed a check for Mr. Brown, giving him dollars instead of cents and cents instead of dollars.  After buying a five cent newspaper, Brown discovered that he had exactly twice as much left as his original check.  What was the amount of the check?




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