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Math and logic riddle thread
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Post Tue, Oct 20 2020, 6:56 pm
Can’t get it less than 18 Banging head
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Post Tue, Oct 20 2020, 6:57 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

Hidden: 

According to this method if the answer is 59 it’s 18 attempts as well
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Post Tue, Oct 20 2020, 7:01 pm
Hidden: 

Ok I got it down to 15 max
15
29
43
55
66
76
85
93

Do you want lower?
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Post Tue, Oct 20 2020, 7:14 pm
Can I go celebrate with ice cream yet?
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↑  SisterSix  ↓




 
 
    
 

Post Tue, Oct 20 2020, 7:17 pm
Does the answer have to do with the fact that, based on the wording, it cannot possibly be the first or 100th floor?
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↑  Tamari  ↓




 
 
    
 

Post Tue, Oct 20 2020, 7:19 pm
ExtraCredit wrote:
Hidden: 

Ok I got it down to 15 max
15
29
43
55
66
76
85
93

Do you want lower?

Not yet.......
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Post Tue, Oct 20 2020, 7:20 pm
SisterSix wrote:
Does the answer have to do with the fact that, based on the wording, it cannot possibly be the first or 100th floor?

It could be any floor. Since you don’t know which floor it’s on, what will be your strategy to get the answer with the least attempts?
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Post Tue, Oct 20 2020, 7:20 pm
Tamari wrote:
Not yet.......

Are you serious? Banging head
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↑  tothepoint  ↓




 
 
    
 

Post Tue, Oct 20 2020, 7:22 pm
ExtraCredit wrote:
Can I go celebrate with ice cream yet?


I think we all deserve ice cream, didn’t we rather solve this through building on each other’s answers?

Ice cream
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Post Tue, Oct 20 2020, 7:25 pm
Hidden: 

Ok this is 13 max
14
27
39
50
60
69
77
84
90
95
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Post Tue, Oct 20 2020, 7:30 pm
Can I get ice cream now?
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Post Tue, Oct 20 2020, 7:30 pm
tothepoint wrote:
I think we all deserve ice cream, didn’t we rather solve this through building on each other’s answers?

Ice cream

You’re eating already? We don’t have the answer yet!
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Post Tue, Oct 20 2020, 7:31 pm
Ok saying
Hidden: 

13
final answer otherwise I give up
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↑  LiLIsraeli  ↓




 
 
    
 

Post Tue, Oct 20 2020, 8:26 pm
Re: the bulb riddle:

Hidden: 

What about if we do it by halves. So start at 50. If it breaks, go down to 25. If it doesn't, go up to 75, each time making the discrepancy half the previous one. You can find the answer in maximum 8 tries. I don't know how to do it with two bulbs, though.
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Post Tue, Oct 20 2020, 8:30 pm
LiLIsraeli wrote:
Re: the bulb riddle:

Hidden: 

What about if we do it by halves. So start at 50. If it breaks, go down to 25. If it doesn't, go up to 75, each time making the discrepancy half the previous one. You can find the answer in maximum 8 tries. I don't know how to do it with two bulbs, though.
what if it breaks by 25 too. Then you’re stuck without bulbs.
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Post Tue, Oct 20 2020, 8:32 pm
I already celebrated on ice cream with the assumption that I got the final answer. Worst case if I’m wrong I’ll have more ice cream tomorrow.
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↑  tothepoint  ↓




 
 
    
 

Post Tue, Oct 20 2020, 8:49 pm
ExtraCredit wrote:
Hidden: 

Ok this is 13 max
14
27
39
50
60
69
77
84
90
95


This is probably the answer, but I think it’s 14
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Post Tue, Oct 20 2020, 8:50 pm
tothepoint wrote:
This is probably the answer, but I think it’s 14

Hidden: 

On which floor would it equal 14? I think 13 works for whichever floor you’ll choose.
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↑  tothepoint  ↓




 
 
    
 

Post Tue, Oct 20 2020, 9:04 pm
ExtraCredit wrote:
Hidden: 

On which floor would it equal 14? I think 13 works for whichever floor you’ll choose.


Let’s start with 14. If it breaks at 14 you still need to try 1-13. (The logic of leaving out the last only works for the 100th floor)
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Post Tue, Oct 20 2020, 9:08 pm
tothepoint wrote:
Let’s start with 14. If it breaks at 14 you still need to try 1-13. (The logic of leaving out the last only works for the 100th floor)

Hidden: 

No, you do 14 then 1-12 is enough. If still didn’t break by 12 you know it’s 13. So that’s 13 attempts!
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