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Math and logic riddle thread
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 20 2020, 4:32 pm
ExtraCredit wrote:
What type of degree do I need to have to attempt this one? Also, do I need a pen?


Out of the box thinking.
no pen...
a degree in economy... or, come to think of it, better not...
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 4:33 pm
ChanieMommy wrote:
Or, to be exact (17+15+10)/2

Exactly, professor!
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 4:34 pm
ChanieMommy wrote:
Out of the box thinking.
no pen...
a degree in economy... or, come to think of it, better not...

Hint please
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 20 2020, 4:38 pm
ExtraCredit wrote:
Hint please

The premise is that they eat the same amount every day... no tricks about winter, summer, grass, hay, calf, no calf, milk, no milk, bigger herd, smaller herd... nothing like this...

And it is a reality: there is one month where they eat less...

Hint2:

Hidden: 

It's about the common civic (gregorian) calendar, it would not work with the jewish calendar...


Hint 3

Hidden: 

It would also work with the Julian calendar


Last edited by ChanieMommy on Tue, Oct 20 2020, 4:44 pm; edited 1 time in total
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 4:41 pm
ChanieMommy wrote:
The premise is that they eat the same amount every day... no tricks about winter, summer, grass, hay, calf, no calf, milk, no milk, bigger herd, smaller herd... nothing like this...

And it is a reality: there is one month where they eat less...

Oh haaaa
Hidden: 

February

And I was thinking which month has the moo or hay sound in it...
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 20 2020, 4:45 pm
ExtraCredit wrote:
Oh haaaa
Hidden: 

February

And I was thinking which month has the moo or hay sound in it...


Yeahhh

Applause Applause Applause Applause Applause Applause Applause Applause Applause Applause
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 4:47 pm
ChanieMommy wrote:
Yeahhh

Applause Applause Applause Applause Applause Applause Applause Applause Applause Applause

The first hint was enough though Laugh
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 4:48 pm
At what hour do they practically starve every day? Laugh

Hidden: 

From 24:00-24:59
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 20 2020, 5:07 pm
ExtraCredit wrote:
At what hour do they practically starve every day? Laugh

Hidden: 

From 24:00-24:59


I thought this was when they got double portions...
Hidden: 

one for 0:00-0:59 and one for 24:00-24:59
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 5:12 pm
ChanieMommy wrote:
I thought this was when they got double portions...
Hidden: 

one for 0:00-0:59 and one for 24:00-24:59

LOL
Perhaps on their special grand-moo-ther clock.
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 5:32 pm
You are living in a 100-floor apartment building. You know that there is one floor in the building, such that if you drop a light bulb from there or anywhere higher, it will crash upon hitting the ground. If you drop a light bulb from any floor underneath it however, the light bulb will remain intact. If you have two light bulbs at your disposal, what is the minimum amount of drop attempts do you need such that you can surely find which the floor in question is?
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 20 2020, 6:09 pm
Tamari wrote:
You are living in a 100-floor apartment building. You know that there is one floor in the building, such that if you drop a light bulb from there or anywhere higher, it will crash upon hitting the ground. If you drop a light bulb from any floor underneath it however, the light bulb will remain intact. If you have two light bulbs at your disposal, what is the minimum amount of drop attempts do you need such that you can surely find which the floor in question is?


Could it be you mean maximum number?

And could it be the answer is
Hidden: 

18



Hidden: 

First, I try the 10th floor. Either the first bulb breaks, then I try floors 1-9 wth the secon bulb, this would be 10 tries if it's floor 9 or 10

Or the first bulb doesn't break. Then I try 20... if it breaks, same as above, this would be 11 tries (if it was floor 19 or 20)

The worst combination would be if it was floor 89 or 90, and this would require 9 attempts with the first bulb to get up to floor 90 plus 9 attempts with the second bulb to get up to floor 89... that would be 18



Last edited by ChanieMommy on Tue, Oct 20 2020, 6:34 pm; edited 2 times in total
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 6:11 pm
Tamari wrote:
You are living in a 100-floor apartment building. You know that there is one floor in the building, such that if you drop a light bulb from there or anywhere higher, it will crash upon hitting the ground. If you drop a light bulb from any floor underneath it however, the light bulb will remain intact. If you have two light bulbs at your disposal, what is the minimum amount of drop attempts do you need such that you can surely find which the floor in question is?

Hidden: 

50, You drop the first on the 50th floor. If it cracks you start on floor 1 and might need to go till 49. If it doesn’t crack you start your way up from 51-99
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 6:13 pm
ChanieMommy wrote:
Hidden: 

I first would make an estimate from which floor on it breaks and drop it from the floor underneaht... If the bulb remains intact, I am lucky and I can start trying from there, going one floor higher for each drop, till it breaks...

If I am unlucky and first bulb breaks, I would have to start from the bottom and go up uptill it breaks...

I woud not try the 50th floor first, because this seems unrealistic... 4th floor could maybe seem realistic...

If the riddle has nothing to do with reality, and there is an equal probality for every floor, I might start at 50...

Anyway, the minimum number of tries would be the floor from which it breaks plus one if I am unlucky, and the floor from which it breaks minus the floor from which I tried plus one if I m lucky


So if you start at 50 and it breaks, how would you proceed? I need a strategy using the minimum amount of attempts regardless of the outcome.
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 6:13 pm
ChanieMommy wrote:
Hidden: 

I first would make an estimate from which floor on it breaks and drop it from the floor underneaht... If the bulb remains intact, I am lucky and I can start trying from there, going one floor higher for each drop, till it breaks...

If I am unlucky and first bulb breaks, I would have to start from the bottom and go up uptill it breaks...

I woud not try the 50th floor first, because this seems unrealistic... 4th floor could maybe seem realistic...

If the riddle has nothing to do with reality, and there is an equal probality for every floor, I might start at 50...

Anyway, the minimum number of tries would be the floor from which it breaks plus one if I am unlucky, and the floor from which it breaks minus the floor from which I tried plus one if I m lucky

I wrote my megilla while you wrote yours. Don’t understand your answer though.
Hidden: 

Why not start at 50? Isn’t it least risky to start at 50? Any other floor might make you need to try more than 50. If you start with the 4th you might need to go till 97.
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 6:18 pm
Tamari am I right?
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 6:20 pm
ExtraCredit wrote:
Tamari am I right?


Geniuses can do better than than Confused
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 6:21 pm
Tamari wrote:
Geniuses can do better than than Confused

Did I misunderstand the question?
If both bulbs crack I’m doomed, right?
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 6:23 pm
ExtraCredit wrote:
Did I misunderstand the question?


I don't think so. There is a better strategy.
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 6:24 pm
Tamari wrote:
I don't think so. There is a better strategy.

Do I need a pen? Laugh
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