| Author |
Message |
    
Andrea Weisbard
Citizen
Username: Njnetsfan
Post Number: 68
Registered: 6-2004
| | Posted on Thursday, March 10, 2005 - 1:28 am: |     |
Here are some riddles, read the first to yourself, and if you can't get the answer, read it out loud.
How many bricks does it take to finish a building made entirely of brick
It starts with the letter "E" ends in the letter "E" but only holds one letter, what is it?
If Mr. Green live in the green house, and Mr. Brown lives in the brown house, who live in the white house(<<<this is the easiest of them all).
If a rooster lays an egg on the roof of the barn, what side of the roof would the egg roll off of?
|
Sgt. Pepper
Citizen
Username: Jjkatz
Post Number: 744
Registered: 12-2003
| | Posted on Thursday, March 10, 2005 - 1:09 pm: | |
Taking a stab at 3 of them:
1. One (the last brick finishes the building).
3. The President.
4. Roosters don't lay eggs. |
Brett
Citizen
Username: Bmalibashksa
Post Number: 1516
Registered: 7-2003
| | Posted on Thursday, March 10, 2005 - 1:19 pm: | |
2. E |
bmpsab
Citizen
Username: Bmpsab
Post Number: 120
Registered: 3-2001
| | Posted on Thursday, March 10, 2005 - 1:22 pm: | |
2. = envelope! |
spw784
Supporter
Username: Spw784
Post Number: 664
Registered: 5-2001
| | Posted on Thursday, March 10, 2005 - 6:06 pm: | |
I would think # 3 would need to have "white house" capitalized for the answer to be the President. . |
E
Citizen
Username: Scubadiver
Post Number: 40
Registered: 8-2004
| | Posted on Thursday, March 10, 2005 - 9:58 pm: | |
Here is a new one for those who like math. This is a mathematical proof that .999 (repeating)=1. Is it true? Is it false? If so, why?
x=.9 (repeating)
10x=9.9 (repeating)
10x-x=9
9x=9
x=1
1= .9 (repeating)
|
Andrea Weisbard
Citizen
Username: Njnetsfan
Post Number: 73
Registered: 6-2004
| | Posted on Thursday, March 10, 2005 - 11:29 pm: | |
True, .999 repeating = 1 if you round it up.
|
E
Citizen
Username: Scubadiver
Post Number: 41
Registered: 8-2004
| | Posted on Friday, March 11, 2005 - 11:10 am: | |
Andrea,
That is not the answer. The proof shows that nothing is being rounded. The claim is that .999 (repeating) "as-is" is exactly equal to 1.
|
Brett
Citizen
Username: Bmalibashksa
Post Number: 1523
Registered: 7-2003
| | Posted on Friday, March 11, 2005 - 11:26 am: | |
yes it does, your rounding to 9 in the third step.
10x-x=9x=9*.999999=8.999999 |
Duncan
Supporter
Username: Duncanrogers
Post Number: 3968
Registered: 12-2001
| | Posted on Friday, March 11, 2005 - 11:26 am: | |
from an MIT Masters in Applied Math (and my lovely wife)
No good because my multiplying .9999 (repeating) by 10 you have to end up with a zero at the end of the repeating which they are ignoring. If that zero is there, it will not work. Try it without the repeating... and you get this..
10x = 9.90
10x - x = 9.90 - .99 = 8.91
9x - 8.91
x - 8.91 / 9 = .99
so unless there is a trick here, Im going with the wife's answer..LOL
|
Andrea Weisbard
Citizen
Username: Njnetsfan
Post Number: 84
Registered: 6-2004
| | Posted on Friday, March 11, 2005 - 11:43 am: | |
Duncan,
You can't blame a girl for trying |
E
Citizen
Username: Scubadiver
Post Number: 42
Registered: 8-2004
| | Posted on Friday, March 11, 2005 - 12:20 pm: | |
Brett,
There is no rounding in the third step. I am subtracting an "x" from the left side and .999 (repeating) on the right side. 9.999 (repeating) minus .999 (repeating) equals 9.
Duncan,
Not true about the ending zero if multiplying by 10. You just move the decimal one place to the right. For example, if you multiply Pi by 10, it would be 31.4159...(non repeating, non terminating, no zero at the "end").
There is no trick here. Regular rules of math provide the answer. It is valid, or it is not. |
macsmom
Citizen
Username: Macsmom
Post Number: 12
Registered: 6-2002
| | Posted on Friday, March 11, 2005 - 1:03 pm: | |
E: There are some arguments or at least discussions) about whether this is true. The info I provided to Duncan was one approach, and in some sense the easy answer.
But you can say that .999 (repeating) is equal to 1. One way of looking at it is that for 2 real numbers to be distinct, you have to be able to identify a number that come between them. What number comes between .999(repeating) and 1? You cannot find one, so they must be equal.
The more mathematical approach is to take .999(repeating) as the sum of an "infinite geometric series of numbers". A "infinite geometric series of numbers" is a pattern of numbers we find by setting a starting point, call it A, determining the next number by multiplying A by some number R.
Then, to find the next number in the pattern, you keep taking the number you get with the multiplication and multipling it again by R (also called the common ratio).
Here, A is .9 and R is .1 .So we get .9, .09, .009, .0009 etc.
The formula for the sum of an infinite geometric series is A / (1 - R) (A is the starting point and R is the multiplier we used).
So A / (1 - R) = .9 / (1 - .1) which equals .9/.9 which equals 1. QED.
On a similar note - do you know the one that proves 1 = 3?
|
Brett
Citizen
Username: Bmalibashksa
Post Number: 1526
Registered: 7-2003
| | Posted on Friday, March 11, 2005 - 1:06 pm: | |
Sucked the fun right out of that one... 
Boy that makes me miss math 
|
Brett
Citizen
Username: Bmalibashksa
Post Number: 1527
Registered: 7-2003
| | Posted on Friday, March 11, 2005 - 1:06 pm: | |
I meant that in a nice way |
macsmom
Citizen
Username: Macsmom
Post Number: 13
Registered: 6-2002
| | Posted on Friday, March 11, 2005 - 1:11 pm: | |
Actually (sadly??), it really did make me miss math! 
I used to love teaching this kind of stuff to my students. Sorry if I got too technical on ya...now you know why Duncan posts and not me.  |
sac
Supporter
Username: Sac
Post Number: 1906
Registered: 5-2001
| | Posted on Friday, March 11, 2005 - 1:23 pm: | |
Me too!
I majored in Math, but never used the really esoteric stuff again ... 25 years later, it is very rusty. |
Brett
Citizen
Username: Bmalibashksa
Post Number: 1529
Registered: 7-2003
| | Posted on Friday, March 11, 2005 - 1:25 pm: | |
I wasn't jokeing. I enjoy math, but never get to do it anymore. Do you know of any books that are less like textbook and more fun? I graduated NJIT so I'm pretty good with math and my Girlfriend is a Chem E from Lehigh. We would enjoy something interesting like that.
|
E
Citizen
Username: Scubadiver
Post Number: 43
Registered: 8-2004
| | Posted on Friday, March 11, 2005 - 1:58 pm: | |
Macsmom,
You obviously know you had the right answer. It's true.
I don't think I've seen the 1=3 (unless it's a form of the 1=2 "proof"). Please share. |
Duncan
Supporter
Username: Duncanrogers
Post Number: 3970
Registered: 12-2001
| | Posted on Friday, March 11, 2005 - 3:42 pm: | |
Dang that wife of mine..Now ask who on MOL I would bunk with.  |
macsmom
Citizen
Username: Macsmom
Post Number: 14
Registered: 6-2002
| | Posted on Friday, March 11, 2005 - 5:25 pm: | |
Actually, the 1=3 one is very techie - involves pi and natural logarithms and mostly is hard to type in this forum. How about this one:
let a=1, b=1
a = a
a^2 = ab
a^2 - b^2 = ab - b^2
(a + b)(a - b) = b(a - b)
a + b = b
1 + 1 = 1
Can you find the problem with this "proof"?? |
sac
Supporter
Username: Sac
Post Number: 1911
Registered: 5-2001
| | Posted on Friday, March 11, 2005 - 8:43 pm: | |
macsmom,
The problem with your proof is that when you divided each side by (a-b), you were dividing by zero. |
PARROT HEAD
Citizen
Username: Island_jack
Post Number: 57
Registered: 3-2004
| | Posted on Friday, March 11, 2005 - 9:05 pm: | |
Here's one from the Parrot.
The man is afraid to go home because the man in the mask is waiting for him.
Who is the man in the mask? |
buzzsaw
Citizen
Username: Buzzsaw
Post Number: 1674
Registered: 5-2001
| | Posted on Friday, March 11, 2005 - 9:18 pm: | |
the catcher |
PARROT HEAD
Citizen
Username: Island_jack
Post Number: 60
Registered: 3-2004
| | Posted on Friday, March 11, 2005 - 10:54 pm: | |
Buzzsaw got it.
The man in the mask is the catcher on a baseball field. Good job |
Phil
Supporter
Username: Barleyrooty
Post Number: 866
Registered: 5-2001
| | Posted on Sunday, March 13, 2005 - 6:03 pm: | |
A man is pushing his car past a hotel when suddenly he realizes he's bankrupt - why? |
dfc
Citizen
Username: Dfc
Post Number: 29
Registered: 7-2001
| | Posted on Sunday, March 13, 2005 - 7:02 pm: | |
An ocean liner is sailing across the sea and sinks. Every single person drowns. Who servives. |
Just The Aunt
Supporter
Username: Auntof13
Post Number: 716
Registered: 1-2004
| | Posted on Sunday, March 13, 2005 - 7:04 pm: | |
Phil
Was he playing Monoply?
Speaking of which, anyone interested in playing a game to the end some day?
And...
If the reflection of a clock in a mirror reads 8:45, what is the real time? |
SoOrLady
Citizen
Username: Soorlady
Post Number: 1867
Registered: 9-2003
| | Posted on Sunday, March 13, 2005 - 7:04 pm: | |
dfc - All the married people? |
Duncan
Supporter
Username: Duncanrogers
Post Number: 3974
Registered: 12-2001
| | Posted on Sunday, March 13, 2005 - 8:21 pm: | |
JTA
4:15
now my contribution...
The soup was cold, the salad was wilted, and the fish was overcooked. When the waiter handed Mr. Essen the bill for his meal, Essen wrote on it "102004180" and strode out of the restaurant. Can you figure out what this meant? |
Andrea Weisbard
Citizen
Username: Njnetsfan
Post Number: 98
Registered: 6-2004
| | Posted on Monday, March 14, 2005 - 9:22 am: | |
A plane crashes on the boarder of the U.S. and Canada, where do the bury survivors? |
SoOrLady
Citizen
Username: Soorlady
Post Number: 1870
Registered: 9-2003
| | Posted on Monday, March 14, 2005 - 9:44 am: | |
Andrea - you don't bury survivors
Duncan - I can't get the beginning - it ends with "for I ate nothing." |
Just The Aunt
Supporter
Username: Auntof13
Post Number: 728
Registered: 1-2004
| | Posted on Monday, March 14, 2005 - 12:48 pm: | |
duncan
answer to yours is:
I ought to owe nothing for I ate nothing
|
SoOrLady
Citizen
Username: Soorlady
Post Number: 1874
Registered: 9-2003
| | Posted on Monday, March 14, 2005 - 6:18 pm: | |
not exactly a riddle, but a cool math puzzle all the same:
· Grab a calculator (you won't be able to do this one in your head)
· Key in the first three digits of your phone number (NOT the area code)
· Multiply by 80
· Add 1
· Multiply by 250
· Add the last 4 digits of your phone number
· Add the last 4 digits of your phone number again
· Subtract 250
· Divide by 2
Do you recognize the answer? |
Carrie Avery
Citizen
Username: Carrie33
Post Number: 204
Registered: 1-2005
| | Posted on Monday, March 14, 2005 - 6:22 pm: | |
WOW! That's cool! thanks. |
Phil
Supporter
Username: Barleyrooty
Post Number: 867
Registered: 5-2001
| | Posted on Tuesday, March 15, 2005 - 3:51 pm: | |
Just the Aunt: Yes! And 3:15 |
Rastro
Citizen
Username: Rastro
Post Number: 756
Registered: 5-2004
| | Posted on Tuesday, March 15, 2005 - 4:16 pm: | |
regarding the clock question...
Actually, it depends where the mirror is. If the mirror isn't perpendicular to the 3 o'clock or 9 o'clock radius, it could be any of several times...
For example, if the mirror is perpendicular to the 12 o'clock radius, it is... 9:45? |
Closed: New threads not accepted on this page