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  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

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Topic review (newest first)

jam-pot
2005-04-21 20:07:07

um errr ok*looks away*

well anyways i think my method works aswell and scorpians burning and pits are a good combination for a party yeah!
well not that good if you burn your armpit with a scorpian???
muahahahahahaha the allmight spatula

MathsIsFun
2005-04-21 08:34:03

So, the two piles have 42 and 10 cards each. There are 10 upside-down cards mixed up in them, and you don't know if the pile of 10 cards has no upside-downs, 1 upside-down, or, freakishly, 10 upside down cards.

If, for example, there are 9 upside-downs in the 42, then there will be 1 upside-down in the 10

Turning the 10-pile upisde down will result in 9 upside-downs, matching the pile of 42.

Does it work for all combinations?

Wow, good party trick.

mathsyperson
2005-04-21 04:37:34

Take the pile of 10 cards, turn it over. Done.

Roraborealis
2005-04-21 01:56:59

I guess that's all that counts.

jam-pot
2005-04-20 23:56:32

you burn em all in a pit of scorpians  ??
well i tryed

Roraborealis
2005-04-19 01:12:23

I haven't got a clue for that one, could you tell me the answer?

j4tt
2005-02-24 19:38:42

Well Another problem not so hard but just thinking...........

There are 52 cards in a pack of cards. If you turn any 10 cards upside down and place them back(upside down) and give them a good shuffel so that the card are at random. Now from the top of the pile pick 10 cards. Using those 10 cards how can you make the same number of card upside down in each pile, without looking into the rest of the pile....????????

j4tt
2005-02-24 19:34:31

I said that you enter x liters of water the first day 2x on the second day and 4x on the second day. I did'nt say there TOTAL!!!! (it mean you keep doubling the amount of water you enter in the pond each day with respect to the amount of water entered the previous day irrespective of the ammount of water in the pond)

MathsIsFun
2005-02-24 07:30:39

Hmmm ... what you enter doubles ... So on the first day it has x liters, on the second day 3x, on the third day 7x, ... after a few days it does get close enough to doubling. In fact you could say it always doubles, except it is always 1x short smile

j4tt
2005-02-24 00:40:27

........................SOLUTION.....................................................
work backwards.. that is if a pond fills in 30 days, it will takes 29 days to fill half of it(doubles each day). this means that it will takes 28 day to fill a quarter of the pond and 27 days to fill 1/8th of it...............

MathsIsFun
2005-02-23 22:03:56

Well, let's see, on the first day it has x liters, on the second day x(1+2), third day x(1+2+4) fourth day x(1+2+4+8), etc...  Am I on the right track? Any geniuses out there?

j4tt
2005-02-23 19:42:05

Great problems.......
my teacher gave me this problem that
If there is an empty pond and you keep adding water such that if you enter x liters on first day, you enter 2x the second day, 4x on the third and so on..  It takes 30 days to fill a pond. How long will it takes to fill 1/8th the pond..????

MathsIsFun
2005-02-23 16:08:11

... that almost makes sense

j4tt
2005-02-22 22:16:11

find the next letter of the sequence......

ze, te, tw, th, fo, fi, si, se, ei,...........

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