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Math and logic riddle thread
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Post Wed, Oct 21 2020, 1:35 pm
ChanieMommy wrote:
If it crashed by 13, it's 13, if it didn't, it's 14...

So the solution is
Hidden: 

you try on floors 14, 27, 39, 50, 60, 69, 77, 84, 90, 95 with your first bulb,till it breaks, and this way you will need 14 tries maximum?

Yes are you happy with the solution? Something bothered you with the wording which I didn’t understand...
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Post Wed, Oct 21 2020, 1:49 pm
tothepoint wrote:
Three prime numbers add up to 100. Of the three numbers, one of them is more than a third but less than a half of another. Find the three numbers.

Hidden: 

2,31,67
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Post Wed, Oct 21 2020, 1:58 pm
tothepoint wrote:
Hidden: 

Grow older!

It’s correct but other answers were correct too.
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  tothepoint  




 
 
    
 

Post Wed, Oct 21 2020, 2:09 pm
ExtraCredit wrote:
Hidden: 

2,31,67


Correct!
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  ChanieMommy  




 
 
    
 

Post Wed, Oct 21 2020, 3:07 pm
ExtraCredit wrote:
Yes are you happy with the solution? Something bothered you with the wording which I didn’t understand...


You are a genius!

I would never have thought of your method, to decrease the difference by one for each test with bulb 1, so as to make up for the one more try with bulb 1...
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  Tamari  




 
 
    
 

Post Wed, Oct 21 2020, 3:10 pm
Tamari wrote:
This one’s serious....
The warden meets with 23 new prisoners when they arrive to prison. He tells them, "You may meet today and plan a strategy. But after today, you will be in isolated cells and will have no communication with one another.
"In the prison is a switch room, which contains two light switches labeled A and B. Both are in the “off” position now. The switches are not connected to anything.
All day long, I will be leading prisoners randomly, one at a time, into the switch room. Every time you’re there, you must flip one switch and you’ll then be led back to your cell.
There’s no limit how many times a prisoner will visit the room, and no particular order which I will follow. One might visit the room 3 times before another would be there even once, but with time, all prisoners will have visited the room the same amount of times.
At any given time, any prisoner may yell “all have visited the room!”
If that will be true, you’ll all be freed. If even one prisoner hasn’t been to the room yet, you’ll all be shot.
I will not purposefully hold back one prisoner from entering the room.”
What plan can they come up with to ensure that they’re freed?

Twist on this riddle:
In this scenario, what if the positions of the switches were unknown? How will the strategy have to be adjusted so that they can still be freed?
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Post Wed, Oct 21 2020, 3:12 pm
ChanieMommy wrote:
You are a genius!

I would never have thought of your method, to decrease the difference by one for each test with bulb 1, so as to make up for the one more try with bulb 1...

Well That was only after she claimed that 18 won’t do it. She tortured me into figuring it out. Very Happy
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  Tamari  




 
 
    
 

Post Wed, Oct 21 2020, 3:28 pm
A sundial has the fewest moving parts of any timepiece. Which has the most?
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Post Wed, Oct 21 2020, 3:29 pm
Tamari wrote:
A sundial has the fewest moving parts of any timepiece. Which has the most?

A grand moo ther clock for the cows?
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  Tamari  




 
 
    
 

Post Wed, Oct 21 2020, 3:35 pm
ExtraCredit wrote:
A grand moo ther clock for the cows?


You haven't stopped moo'ing even after 14 scoops of ice cream?
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  SisterSix  




 
 
    
 

Post Wed, Oct 21 2020, 3:36 pm
Tamari wrote:
A sundial has the fewest moving parts of any timepiece. Which has the most?


Hidden: 


The sun
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  ChanieMommy  




 
 
    
 

Post Wed, Oct 21 2020, 3:37 pm
Tamari wrote:
A sundial has the fewest moving parts of any timepiece. Which has the most?

Hidden: 

an hourglass?
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  Tamari  




 
 
    
 

Post Wed, Oct 21 2020, 3:38 pm
ChanieMommy wrote:
Hidden: 

an hourglass?


Correct
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Post Wed, Oct 21 2020, 3:40 pm
Tamari wrote:
You haven't stopped moo'ing even after 14 scoops of ice cream?

That was yesterday! What has that got to do with today?
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  ChanieMommy  




 
 
    
 

Post Wed, Oct 21 2020, 3:40 pm
Tamari wrote:
Twist on this riddle:
In this scenario, what if the positions of the switches were unknown? How will the strategy have to be adjusted so that they can still be freed?


You mean that you can see no difference between the "on" and "off" position in both of the switches, like it is the case with most switches today?

Or do you mean that there are two clearly identifiable different positions for each switch, but people do not know on which position it is starting the ordeal?
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  ExtraCredit  




 
 
    
 

Post Wed, Oct 21 2020, 3:40 pm
ChanieMommy wrote:
Hidden: 

an hourglass?

Good one!
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  Tamari  




 
 
    
 

Post Wed, Oct 21 2020, 3:42 pm
ChanieMommy wrote:
You mean that you can see no difference between the "on" and "off" position in both of the switches, like it is the case with most switches today?

Or do you mean that there are two clearly identifiable different positions for each switch, but people do not know on which position it is starting the ordeal?


The prisoners are not told whether it's UP or DOWN.
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  ChanieMommy  




 
 
    
 

Post Wed, Oct 21 2020, 3:43 pm
ExtraCredit wrote:
That was yesterday! What has that got to do with today?


New day, new icecream...

Although I officially decided the season was over...

Should I come back on my decision and make a new badge???

wondering wondering wondering
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  ExtraCredit  




 
 
    
 

Post Wed, Oct 21 2020, 3:43 pm
ChanieMommy wrote:
You mean that you can see no difference between the "on" and "off" position in both of the switches, like it is the case with most switches today?

Or do you mean that there are two clearly identifiable different positions for each switch, but people do not know on which position it is starting the ordeal?

I think she means that you don’t know whether they are on or off to begin with. In the original riddle you knew both started at off!
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  ExtraCredit  




 
 
    
 

Post Wed, Oct 21 2020, 3:44 pm
ChanieMommy wrote:
New day, new icecream...

Although I officially decided the season was over...

Should I come back on my decision and make a new badge???

wondering wondering wondering

No there’s popcorn now. Popcorn Popcorn Popcorn
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