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ravvy
Joined: Jul 25, 2007
Location: Sam's Closet
Posts: 8697
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 Posted: April 27, 2008 2:27 am Post subject: tom riddles |
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Three men decided to split the cost of a hotel room. The hotel manager gave them a price of $30. The men split the bill evenly, each paying $10, and retired to their room.
However, the manager realized that it was a Wednesday night, which meant the hotel had a special: rooms were only $25. He had overcharged them $5!
He promptly called the bellboy, gave him five one-dollar bills and told him to return it to the men. When the bellboy explained the situation to the men, they were so pleased at the honesty of the establishment that they promptly tipped the bellboy $2 of the $5 he had returned and each kept $1 for himself.
The Problem: Each of the three men ended up paying $9 (their original $10, minus $1 back) totaling $27, plus $2 for the bellboy makes $29. Where did the extra dollar go?
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Last edited by ravvy on May 21, 2008 5:48 am; edited 1 time in total |
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Arabella
Joined: Jun 17, 2007
Location: In my field of paper flowers
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| Posted: April 27, 2008 2:45 am Post subject: |
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ginny eated it
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GinnyX
Joined: May 6, 2007
Location: I'm in a New York state of mind.
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| Posted: April 27, 2008 2:54 am Post subject: |
GinnyX
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I did. 
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Breathing is optional.
Look, Bella, look. |
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ravvy
Joined: Jul 25, 2007
Location: Sam's Closet
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| Posted: April 27, 2008 7:25 am Post subject: |
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lol no ginny no eated it... its in the riddle, you just have to figure it out. anyone wanna give it a shot?
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Duelingwands
Joined: Jul 27, 2007
Location: The Forbidden Forest
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| Posted: April 27, 2008 7:38 am Post subject: |
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Men paid $30
Given back $5
Kept $3
Bellboy gets $2
I hope I have it right. I'm sort of foggy right now having just woken up..
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ravvy
Joined: Jul 25, 2007
Location: Sam's Closet
Posts: 8697
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| Posted: April 27, 2008 7:42 am Post subject: |
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| Duelingwands wrote: |
Men paid $30
Given back $5
Kept $3
Bellboy gets $2
I hope I have it right. I'm sort of foggy right now having just woken up.. |
good job!!!!
The faulty reasoning lies in the addition at the end. 3 x $9 does equal $27, but the $2 tip is included in that $27, so it makes no sense to add the $2 to $27 to make $29. They paid $25 for the hotel room, $2 for the tip ($27), and then got $1 back each to make the original $30.
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A Proof That 2 = 1
X = Y Given
X2 = XY Multiply both sides by X
X2 - Y2 = XY - Y2 Subtract Y2 from both sides
(X + Y)(X - Y) = Y(X - Y) Factor both sides
(X + Y) = Y Cancel out common factors
Y + Y = Y Substitute in from line (1)
2Y = Y Collect the Y's
2 = 1 Divide both sides by Y
whats wrong with this proof?
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Last edited by ravvy on April 27, 2008 7:49 am; edited 3 times in total |
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Duelingwands
Joined: Jul 27, 2007
Location: The Forbidden Forest
Posts: 3863
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| Posted: April 27, 2008 7:43 am Post subject: |
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Woohoo! I've heard that before but this is the first time I actually spent time to do it.
Would you mind if I posted a riddle?
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ravvy
Joined: Jul 25, 2007
Location: Sam's Closet
Posts: 8697
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| Posted: April 27, 2008 7:51 am Post subject: |
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| Duelingwands wrote: |
Woohoo! I've heard that before but this is the first time I actually spent time to do it.
Would you mind if I posted a riddle? |
i dont mind. i can do mine later or someone can quote it with the answer.
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Duelingwands
Joined: Jul 27, 2007
Location: The Forbidden Forest
Posts: 3863
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| Posted: April 27, 2008 10:47 am Post subject: |
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| ravvy wrote: |
A Proof That 2 = 1
X = Y Given
X2 = XY Multiply both sides by X
X2 - Y2 = XY - Y2 Subtract Y2 from both sides
(X + Y)(X - Y) = Y(X - Y) Factor both sides
(X + Y) = Y Cancel out common factors
Y + Y = Y Substitute in from line (1)
2Y = Y Collect the Y's
2 = 1 Divide both sides by Y
whats wrong with this proof? |
In step 2, by multiplying both sides by X it would be X^2 on the one side, not 2X.
X times X is X^2
X times 2 is 2X
Caught that immediatly, but nice riddle.
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ravvy
Joined: Jul 25, 2007
Location: Sam's Closet
Posts: 8697
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| Posted: April 27, 2008 2:54 pm Post subject: |
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| Duelingwands wrote: |
| ravvy wrote: |
A Proof That 2 = 1
X = Y Given
X2 = XY Multiply both sides by X
X2 - Y2 = XY - Y2 Subtract Y2 from both sides
(X + Y)(X - Y) = Y(X - Y) Factor both sides
(X + Y) = Y Cancel out common factors
Y + Y = Y Substitute in from line (1)
2Y = Y Collect the Y's
2 = 1 Divide both sides by Y
whats wrong with this proof? |
In step 2, by multiplying both sides by X it would be X^2 on the one side, not 2X.
X times X is X^2
X times 2 is 2X
Caught that immediatly, but nice riddle. |
'Cancelling' the common factors from line (4) to (5) means dividing by the factor (X-Y). Since X=Y, this is a division by 0, the results of which are undefined.
(1) X = Y Given
(2) X2 = XY Multiply both sides by X
(3) X2 - Y2 = XY - Y2 Subtract Y2 from both sides
(4) (X + Y)(X - Y) = Y(X - Y) Factor both sides
(5) (X + Y) = Y Cancel out common factors
(6) Y + Y = Y Substitute in from line (1)
(7) 2Y = Y Collect the Y's
( 2 = 1 Divide both sides by Y
either way is your turn
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zengrenouille
Joined: Aug 1, 2007
Location: Sharon, PA
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| Posted: April 27, 2008 3:43 pm Post subject: |
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These a Nancy boy riddles. Give us a difficult one.
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halfbloodprincess
Joined: Apr 4, 2007
Location: Forever with Erik
Posts: 28168
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| Posted: May 3, 2008 2:16 pm Post subject: |
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cool!!!
oh im such an idiot!!!
i was never really good with math...
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I love my handsome Erik
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Morgan_Shay
Joined: Jan 15, 2008
Location: Devil May Cry, trying to persuade Dante to effing kill the Twilight Series.
Posts: 5214
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| Posted: May 3, 2008 2:27 pm Post subject: |
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If a chicken and a half lays and egg and a half in an hour and a half how many pancakes does it take to shingle a doghouse?
Hurr hurr.
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ravvy
Joined: Jul 25, 2007
Location: Sam's Closet
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| Posted: May 3, 2008 6:48 pm Post subject: |
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| Morgan_Shay wrote: |
If a chicken and a half lays and egg and a half in an hour and a half how many pancakes does it take to shingle a doghouse?
Hurr hurr. |
i like you.
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flamingmonkey923
Joined: Jul 7, 2007
Location: Wandering around in my brain
Posts: 4453
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| Posted: May 3, 2008 9:44 pm Post subject: |
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I can prove that e (which is generally accepted to be 2.718281828...) is 2
This is Pie
This is 2 Pi
Pie = 2 Pi
(divide by Pi)
e = 2
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lozinja
Joined: Nov 4, 2007
Location: australia
Posts: 4748
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| Posted: May 4, 2008 12:49 am Post subject: |
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^it may just be because i'm hopeless when it comes to maths, but was that meant to make sense? because it didn't for me...
i dunno maybe i'm just a little stupid........
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DON'T EAT THE DAISIES |
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flamingmonkey923
Joined: Jul 7, 2007
Location: Wandering around in my brain
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| Posted: May 4, 2008 7:59 am Post subject: |
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| lozinja wrote: |
^it may just be because i'm hopeless when it comes to maths, but was that meant to make sense? because it didn't for me...
i dunno maybe i'm just a little stupid........ |
It's a joke, obviously. It's not real math since it involves a pie and the fact that a major math symbol is spelled 'pi.'
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Duelingwands
Joined: Jul 27, 2007
Location: The Forbidden Forest
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| Posted: May 4, 2008 9:31 am Post subject: |
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Haha, that was funny FM.
Here's mine:
Which way do you say it? The yolk of the egg is white or the yolk of the egg are white?
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Morgan_Shay
Joined: Jan 15, 2008
Location: Devil May Cry, trying to persuade Dante to effing kill the Twilight Series.
Posts: 5214
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| Posted: May 4, 2008 11:42 am Post subject: |
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| ravvy wrote: |
| Morgan_Shay wrote: |
If a chicken and a half lays and egg and a half in an hour and a half how many pancakes does it take to shingle a doghouse?
Hurr hurr. |
i like you. |
I like you, too.
In order to solve my riddle you need an answer that makes as much sense as the question, which here is:
"A telephone pole, because motorcycles don't have doors."
| Duelingwands wrote: |
Haha, that was funny FM.
Here's mine:
Which way do you say it? The yolk of the egg is white or the yolk of the egg are white? |
Neither. The yolk is yellow.
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flamingmonkey923
Joined: Jul 7, 2007
Location: Wandering around in my brain
Posts: 4453
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| Posted: May 4, 2008 1:08 pm Post subject: |
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| Duelingwands wrote: |
| Haha, that was funny FM. |
*takes a bow*
| Duelingwands wrote: |
Here's mine:
Which way do you say it? The yolk of the egg is white or the yolk of the egg are white? |
well I say 'it' with an 'i' and then a 't.'
| Morgan_Shay wrote: |
In order to solve my riddle you need an answer that makes as much sense as the question, which here is:
"A telephone pole, because motorcycles don't have doors." |
"Who is smarter than our current president?"
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ravvy
Joined: Jul 25, 2007
Location: Sam's Closet
Posts: 8697
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| Posted: May 4, 2008 6:33 pm Post subject: |
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| flamingmonkey923 wrote: |
"Who is smarter than our current president?" |
is that a trick question FM
like who can jump higher than the highest mountain?
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Duelingwands
Joined: Jul 27, 2007
Location: The Forbidden Forest
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| Posted: May 4, 2008 7:10 pm Post subject: |
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FM, your answer to my riddle is correct. I just made it up using the classic play on words.
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flamingmonkey923
Joined: Jul 7, 2007
Location: Wandering around in my brain
Posts: 4453
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| Posted: May 4, 2008 7:34 pm Post subject: |
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| ravvy wrote: |
| flamingmonkey923 wrote: |
"Who is smarter than our current president?" |
is that a trick question FM
like who can jump higher than the highest mountain? |
No it was the answer to her question... or the question to her answer rather.
Q: Who is smarter than our current president?
A: A telephone pole, because motorcycles don't have doors.
Obviously
| Duelingwands wrote: |
| FM, your answer to my riddle is correct. I just made it up using the classic play on words. |
Really? I was just being fecetious. See kids? Sarcasm does pay off.
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ravvy
Joined: Jul 25, 2007
Location: Sam's Closet
Posts: 8697
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| Posted: May 4, 2008 7:52 pm Post subject: |
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