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Math and logic riddle thread
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 9:25 pm
ExtraCredit wrote:
Do I need a pen? Laugh


You should grab one. This time for real!
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  tothepoint  




 
 
    
 

Post Tue, Oct 20 2020, 9:26 pm
Can you name the one thing that all people on earth do simultaneously?
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 9:29 pm
Oh ok I got it less already.
Hidden: 

Do by tens.
I start at 10. If it cracks, I try 1-9. If it doesn’t crack I go to 20,30,40... max this would need is get till 90 plus 91-100 so 19 max. Do you want less?


Last edited by ExtraCredit on Tue, Oct 20 2020, 9:32 pm; edited 1 time in total
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 9:29 pm
tothepoint wrote:
Can you name the one thing that all people on earth do simultaneously?

Hidden: 

Breathe?
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 20 2020, 9:37 pm
Tamari wrote:
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.


Could it be you meant "What is the maximum number of attempts I might need to find out which floor the breaking floor is, regardless where it is?

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

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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 9:38 pm
ChanieMommy wrote:
Could it be you meant "What is the maximum number of attempts I might need to find out which floor the breaking floor is, regardless where it is?

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


Hidden: 

I wrote the same answer but wrote 19 to include 100. But you’re right I don’t need to try once I know for sure it’s 100. But your explanation goes till 90. Why not 100?
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 9:39 pm
ChanieMommy wrote:
Could it be you meant "What is the maximum number of attempts I might need to find out which floor the breaking floor is, regardless where it is?

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



You and ExtraCredit both have the same answer.....you're getting warmer, but still not the correct answer.
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  tothepoint  




 
 
    
 

Post Tue, Oct 20 2020, 9:40 pm
My answer to bulb
Hidden: 

is to try every 8th or 9th floor.
Both will give you 19 attempts in worst case scenario
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 9:42 pm
Hidden: 

It should be 18 with the last try being 99
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 20 2020, 9:43 pm
Tamari wrote:
I don't think so. There is a better strategy.


If you are really asking "what is the minimum number of attempts I need?", then the answer would be 1, but it depend on the floor in question being the first floor (and me trying the first floor first),
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 9:43 pm
Tamari wrote:
You and ExtraCredit both have the same answer.....you're getting warmer, but still not the correct answer.

Hidden: 

Can we get it less than 18?
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 20 2020, 9:47 pm
ExtraCredit wrote:
Hidden: 

I wrote the same answer but wrote 19 to include 100. But you’re right I don’t need to try once I know for sure it’s 100. But your explanation goes till 90. Why not 100?


Hidden: 

If the first bulb doesn't break on floor 90, I still have 2 bulbs left... So I go to 95 or 93... and I would need maximum 14 attempts
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 9:50 pm
ChanieMommy wrote:
If you are really asking "what is the minimum number of attempts I need?", then the answer would be 1, but it depend on the floor in question being the first floor (and me trying the first floor first),

I'm all confused now with the wording, but you know what I mean...I need to know in how many attempts I will definitely know which floor. It's possible in less than 18.
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 9:50 pm
ChanieMommy wrote:
Hidden: 

If the first bulb doesn't break on floor 90, I still have 2 bulbs left... So I go to 95 or 93... and I would need maximum 14 attempts

You are right again, professor.
Hidden: 

So 89 is worse than 99. But she’s not happy with our 18 either. That’s the minimum I can do so far.
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 9:51 pm
Tamari wrote:
I'm all confused now with the wording, but you know what I mean...I need to know in how many attempts I will definitely know which floor. It's possible in less than 18.

Yea I don’t get chaniemommys question either. We are trying to find out what would be the minimum amount of tries necessary.


Last edited by ExtraCredit on Tue, Oct 20 2020, 9:52 pm; edited 1 time in total
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 9:52 pm
ChanieMommy wrote:
Hidden: 

If the first bulb doesn't break on floor 90, I still have 2 bulbs left... So I go to 95 or 93... and I would need maximum 14 attempts

What if it doesn't break at 95? You'll need to go till 99....how can you do this in 14 attempts?
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 20 2020, 9:53 pm
Tamari wrote:
What if it doesn't break at 95? You'll need to go till 99....how can you do this in 14 attempts?

She was just explaining why 89 is worse than 99
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  tothepoint  




 
 
    
 

Post Tue, Oct 20 2020, 9:54 pm
Ok I have a shorter way than 18

Hidden: 

First try
15
30
45
60
70
80
90
The worst case scenario will be 17 attempts
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  ChanieMommy  




 
 
    
 

Post Tue, Oct 20 2020, 9:55 pm
tothepoint wrote:
Can you name the one thing that all people on earth do simultaneously?


Hidden: 

Exist?
Be subject to gravity?
Grow hair?
Grow nails?
Create new cells?/divide cells?
Breathe?
Let their heart beat?
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  Tamari  




 
 
    
 

Post Tue, Oct 20 2020, 9:55 pm
tothepoint wrote:
Ok I have a shorter way than 18

Hidden: 

First try
15
30
45
60
70
80
90
The worst case scenario will be 17 attempts


Better, but not tothepoint
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