BrainDen.com - Brain Teasers

# dgreening

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13

1. ## Simple classic puzzle on profit

Pickett makes a good point about not knowing the original price that Bill paid, but based on the data as presented
2. ## A bug problem

Sorry, something got lost in copying and pasting. The site does not like the formatting used in word, so I am attaching a picture of the solution ... apologies in advance.
3. ## A bug problem

A friend and I were working on this. Mark came up with an elegant solution. Close-form (explicit function) solution: .
4. ## A perfect lamp

This is very interesting, but I think there is a more concrete answer.
5. ## Spin the bottle (no kissing involved)

My first thought was like Capt Ed. BUT thinking about it some more.
6. ## gambling strategy

No dispute here.
7. ## Precision Dornicks

Aha! I just didn't follow the same process through to get the supper precision devices! Thanks

10. ## Code needs testing.

Perhaps some more description of the task would help. What is the context for this question??
11. ## gambling strategy

Now I am confused. I think I followed the strategy you described yesterday, when you postulated that it would deliver 100% chance of winning. But, now your simulation it gives you a 50% chance of winning. Did I miss something??
12. ## gambling strategy

I was working on the strategy that you describe: Bet half my money [rounded to an integer]; orbet the "ceiling" [twice my original money - Current money].Testing this in a spread sheet [with only about 100 trials] I am winning about 62% of the time.
13. ## Serial numbers...but!

The hint about primary numbers did not help, but I noticed a pattern

Thanks
15. ## How big is the ladder

I would be interested in how you calculated your answer. I came up with something slightly different
16. ## Maths Teaser

While driving home last night I realized that I had made the problem much more complicated than it needed to be
17. ## Maths Teaser

If we assume that all 1000 bottles might be used ... one approach
18. ## Dice Game

Maybe I am looking at this too simplistically

20. ## Random bullets

I seem to recall, something similar to this. I assume we can use the following simplifying assumptions: Bullets travel to infinity [unless annihilated]Bullets follow the same path [or can be assumed to follow a straight line]
21. ## Next numbers in this series

I d not see that coming. The classic solution is to find numbers that sandwiched between 2 prime numbers.
22. ## Can't find the receipt

Very nice apprach! I missed that relationship ... good job.
23. ## Can't find the receipt

Question for harey: how did you solve for the quantitites?? Thanks ....
24. ## Can't find the receipt

I have been working on this a few days. bonanova is right
25. ## Highest of the lows

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