Posted: Thu Oct 11, 2007 7:46 pm
The return of binary says that between %1(= 1) and %100(= 8 ) there are no nines.Rook Zimbabwe wrote:How many 9's between 1 and 100?
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Posted: Thu Oct 11, 2007 7:52 pm
Rook Zimbabwe wrote:How many 9's between 1 and 100?
between 1 and 100 there are only " -a-n-d- ", so, no "9"
Posted: Thu Oct 11, 2007 8:07 pm
9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 2x 99Rook Zimbabwe wrote:How many 9's between 1 and 100?
=> twenty nines between 1 and 100
Posted: Fri Oct 12, 2007 3:30 am
Kaeru gets it!!! 
It si sinded 20,,,
and the fish is 72 inches so you are all right!
But who keeps the fish? - Einstiens Riddle
It si sinded 20,,,and the fish is 72 inches so you are all right!
But who keeps the fish? - Einstiens Riddle
Posted: Fri Oct 12, 2007 3:35 am
I am an honest person, and am thinking of one of three numbers: 1, 2 or 3. You may ask me EXACTLY one yes-no question, I will answer truthfully, and if you chose the right question, you will know which number I'm thinking of! (HINT: if I cannot answer your question, I will say I cannot answer it). -- What is the right question?
Posted: Fri Oct 12, 2007 7:53 am
What ^o^Rook Zimbabwe wrote:I am an honest person, and am thinking of one of three numbers: 1, 2 or 3. You may ask me EXACTLY one yes-no question, I will answer truthfully, and if you chose the right question, you will know which number I'm thinking of! (HINT: if I cannot answer your question, I will say I cannot answer it). -- What is the right question?
Posted: Fri Oct 12, 2007 8:10 am
Thats a good example of a nice common grid-type logic puzzle, no so common when Einstien created it though. Pretty clever in its day but instead of 99% of people being unable to solve it then, I bet it's close to 99% of people able to solve it now. Still I bet its hard to solve in your head (rather than using a grid).But who keeps the fish?
Posted: Fri Oct 12, 2007 9:01 am
This may not be a perfect solution but it's my first attempt: If you take the number you are thinking of and divide it by one less than that same number ( #/(#-1) ) is the answer 2?I am an honest person, and am thinking of one of three numbers: 1, 2 or 3. You may ask me EXACTLY one yes-no question, I will answer truthfully, and if you chose the right question, you will know which number I'm thinking of! (HINT: if I cannot answer your question, I will say I cannot answer it). -- What is the right question?
Hopefully with the possible answers this should give the following answers: yes=2, no=3, cannot answer=1 .
Posted: Fri Oct 12, 2007 2:03 pm
Both myself and the wife solved Einsteins puzzle independantly and both in less than ten minutes so I don't think it is quite as hard now as it was in his day!! (and before anyone asks, the missus solved it first, by a few minutes!) 
Posted: Fri Oct 12, 2007 2:13 pm
Derek: Did you use pen and paper or was it all done in your head? I cheated and used a pen and paper.
Posted: Fri Oct 12, 2007 2:21 pm
Definately a pen and paper job. 
I wasn't going to try it as I thought hint 4 'The green house is on the left of the white house.' was ambiguous until I saw on the net another description which says ' on the left and next to the white house.' so I gave it a go.
Not a bad little puzzle but actually quite easy when you set your mind to it!
I wasn't going to try it as I thought hint 4 'The green house is on the left of the white house.' was ambiguous until I saw on the net another description which says ' on the left and next to the white house.' so I gave it a go.
Not a bad little puzzle but actually quite easy when you set your mind to it!
Posted: Fri Oct 12, 2007 3:40 pm
I'd simply ask you what number you are thinking ofI am an honest person, and am thinking of one of three numbers: 1, 2 or 3. You may ask me EXACTLY one yes-no question, I will answer truthfully, and if you chose the right question, you will know which number I'm thinking of! (HINT: if I cannot answer your question, I will say I cannot answer it). -- What is the right question?
Posted: Fri Oct 12, 2007 6:57 pm
@Demivec: Your solution is simpler than mine... I have to look at it again but I think it works as well!!! Good job!!!
Posted: Fri Oct 12, 2007 6:59 pm
The ages of a father and son add up to 66. The father's age is the son's age reversed.
How old could they be?
(Find all 3 solutions)
I copied this one... the thrid set took me about an hour the first two were easy... Brainblock!
Posted: Fri Oct 12, 2007 8:45 pm
(60,6), (51,15), (42,24)The ages of a father and son add up to 66. The father's age is the son's age reversed.
How old could they be?
(Find all 3 solutions)