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OrgoneConclusion
Blue Fish Group



Registered: 04/01/07
Posts: 45,414
Loc: Under the C
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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!
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deff
just love everyone



Registered: 05/01/04
Posts: 9,406
Loc: clarity
Last seen: 2 hours, 20 minutes
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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
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secondorder
Amanda Hug'n'kiss



Registered: 04/05/15
Posts: 532
Loc: Queensland, Australia
Last seen: 9 months, 6 days
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Re: mathematical brain teaser thread [Re: deff]
#21870693 - 06/28/15 09:31 PM (8 years, 6 months ago) |
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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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Sun King



Registered: 02/15/14
Posts: 4,069
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Re: mathematical brain teaser thread [Re: secondorder]
#21872051 - 06/29/15 05:55 AM (8 years, 6 months ago) |
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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).

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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DividedQuantum
Outer Head


Registered: 12/06/13
Posts: 9,819
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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?
-------------------- Vi Veri Universum Vivus Vici
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Sun King



Registered: 02/15/14
Posts: 4,069
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I found 11 solutions on google.
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DividedQuantum
Outer Head


Registered: 12/06/13
Posts: 9,819
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Re: mathematical brain teaser thread [Re: Sun King]
#21882672 - 07/01/15 12:07 PM (8 years, 6 months ago) |
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So it can be done.
-------------------- Vi Veri Universum Vivus Vici
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cowsRmeat
Don't step on the MomeRaths



Registered: 04/23/14
Posts: 3,153
Loc: Wonderland
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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?
-------------------- 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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DisoRDeR
motional



Registered: 08/29/02
Posts: 1,158
Loc: nonsensistan
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1 - 2 - 3 - 4 + 5! + 6 - 7 - 8 - √9 = 100
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DividedQuantum
Outer Head


Registered: 12/06/13
Posts: 9,819
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Re: mathematical brain teaser thread [Re: DisoRDeR]
#21883040 - 07/01/15 02:07 PM (8 years, 6 months ago) |
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I will definitely accept that.

Anyone else?
-------------------- Vi Veri Universum Vivus Vici
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DisoRDeR
motional



Registered: 08/29/02
Posts: 1,158
Loc: nonsensistan
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Aww -- I was trying to break the game 
How about -1 + 23 + d456/dx + 78 +d9/dx
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DividedQuantum
Outer Head


Registered: 12/06/13
Posts: 9,819
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Re: mathematical brain teaser thread [Re: DisoRDeR]
#21883589 - 07/01/15 04:10 PM (8 years, 6 months ago) |
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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.
-------------------- Vi Veri Universum Vivus Vici
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Sun King



Registered: 02/15/14
Posts: 4,069
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1+2+3+4+5+6+7+(8*9)
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DividedQuantum
Outer Head


Registered: 12/06/13
Posts: 9,819
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Re: mathematical brain teaser thread [Re: Sun King]
#21883698 - 07/01/15 04:34 PM (8 years, 6 months ago) |
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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.
-------------------- Vi Veri Universum Vivus Vici
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Sun King



Registered: 02/15/14
Posts: 4,069
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Re: mathematical brain teaser thread [Re: Sun King]
#21883792 - 07/01/15 04:59 PM (8 years, 6 months ago) |
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1+2^3-4+(5*6)+(7*8)+9
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Anahata


Registered: 02/25/12
Posts: 2,399
Last seen: 2 days, 23 hours
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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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DividedQuantum
Outer Head


Registered: 12/06/13
Posts: 9,819
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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?
-------------------- Vi Veri Universum Vivus Vici
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secondorder
Amanda Hug'n'kiss



Registered: 04/05/15
Posts: 532
Loc: Queensland, Australia
Last seen: 9 months, 6 days
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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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DividedQuantum
Outer Head


Registered: 12/06/13
Posts: 9,819
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Re: mathematical brain teaser thread [Re: secondorder]
#21936208 - 07/13/15 07:14 AM (8 years, 6 months ago) |
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-------------------- Vi Veri Universum Vivus Vici
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DividedQuantum
Outer Head


Registered: 12/06/13
Posts: 9,819
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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?
-------------------- Vi Veri Universum Vivus Vici
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