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

9. Precision Dornicks

An answer for part 1
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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