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 03-11-2009, 12:52 PM #1 (permalink) Family Member   Join Date: Dec 2008 Location: Philippines Posts: 1,421 Test your analytical skills. I know this is an old and funny math problem. But I wish to share it with you. What's twelve divided by one half?
 03-11-2009, 02:57 PM #2 (permalink) Senior Member   Join Date: Sep 2008 Posts: 352 = 24
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Quote:
 Originally Posted by drama07 = 24
^^ right

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Quote:
 Originally Posted by magi13 ^^ right
Thats it

 03-12-2009, 03:51 AM #5 (permalink) Family Member   Join Date: Dec 2008 Location: Philippines Posts: 1,421 That's it, most people answer 6, when they see that. 12/ 1/2
 03-12-2009, 04:19 AM #6 (permalink) Family Member   Join Date: Dec 2008 Location: Philippines Posts: 1,421 Here's another one. three girls went to a motel and rented a room for 30 \$ they each paid 10 \$. The owner realized that the price was only 25\$ and ordered his slave to return the 5 \$. The slave in turn gave one dollar each to the girls and kept the other 2 for donation. Now each of the girls paid 9 \$, multiply that by 3 = 27 +2(which the slave had) = 29. What happened to the 1 dollar?
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Quote:
 Originally Posted by magi13 Here's another one. three girls went to a motel and rented a room for 30 \$ they each paid 10 \$. The owner realized that the price was only 25\$ and ordered his slave to return the 5 \$. The slave in turn gave one dollar each to the girls and kept the other 2 for donation. Now each of the girls paid 9 \$, multiply that by 3 = 27 +2(which the slave had) = 29. What happened to the 1 dollar?
The 27 is money paid and the 2 is money received. You shouldn't add paid and received amounts. Instead you should subtract them, finding 25 which is the amount that the owner received and everything turns out to be correct.

Also, the 27 and the 2 refer to the situation after all payments have been done while the 30 refers to the situation after the first payment. Equaling total amounts received an paid should be done at the same instant of time.

 03-12-2009, 01:51 PM #8 (permalink) Family Member   Join Date: Dec 2008 Location: Philippines Posts: 1,421 The guys paid an extra of 2 dollars ^,^ Good show.
 03-12-2009, 01:52 PM #9 (permalink) Family Member   Join Date: Dec 2008 Location: Philippines Posts: 1,421 Here's another one: Brothers and Sister I have none. But this man's father, is my father's son. Answer?
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Quote:
 Originally Posted by magi13 Here's another one: Brothers and Sister I have none. But this man's father, is my father's son. Answer?
Son

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Quote:
 Originally Posted by frajilthunder Son

 03-12-2009, 09:20 PM #12 (permalink) Banned   Join Date: May 2007 Location: in your fridge Posts: 2,018 Try these What is the value of 2006 x 2008 - 2007 x 2007? (no calculators!) How many two digit numbers N have the property that the sum of N and the number formed by reversing the digits of N is a square?
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Quote:
 Originally Posted by Plato Try these What is the value of 2006 x 2008 - 2007 x 2007? (no calculators!)
(2007-1)*(2007+1)-2007*2007 = 4014-2 = 4012

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Quote:
 Originally Posted by Plato Try these What is the value of 2006 x 2008 - 2007 x 2007? (no calculators!)
(-1?) my intuition told me that if i were to multiply both of the i'll multiply the last numbers first. the first ended up in 8 the later 9 so i figured 8-9= -1 then just added the 2000 in the equation.

Quote:
 How many two digit numbers N have the property that the sum of N and the number formed by reversing the digits of N is a square?
I'm still stumped with the second one hehe.

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Quote:
 Originally Posted by magi13 (-1?) my intuition told me that if i were to multiply both of the i'll multiply the last numbers first. the first ended up in 8 the later 9 so i figured 8-9= -1 then just added the 2000 in the equation.
Correct.

You rearrange it as 2006 x 2007 - 2007 x 2007 = -2007. Then add the missing 2006 to get the answer of -1.

The second one is a bit cumbersome actually.

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Quote:
 Originally Posted by Ralph (2007-1)*(2007+1)-2007*2007 = 4014-2 = 4012
Hmmm, you missed a bit here.

(2007-1)*(2007+1) = 2007*2007 -2007 + 2007 -1 = 2007*2007 - 1

 03-13-2009, 02:51 AM #17 (permalink) Junior Member   Join Date: Jan 2009 Posts: 13 hmmm, magi13 are you going through Marilyn vos Savant's Brain Building book ?
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Quote:
 Originally Posted by Ajit Odedra hmmm, magi13 are you going through Marilyn vos Savant's Brain Building book ?
the riddles are fun, ^^, just a few sir. :3 some riddles that are readily available.

 03-16-2009, 04:33 PM #19 (permalink) Family Member   Join Date: Dec 2008 Location: Philippines Posts: 1,421 memory trivia, When you're using the method of loci, can you re use the same location for memorizing new set of data, but without forgetting the old? If yes, how If no, how Tip, the answer is not no.
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Quote:
 Originally Posted by magi13 Here's another one: Brothers and Sister I have none. But this man's father, is my father's son. Answer?
You have a brother but unfortunately he died after giving birth to this man

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Quote:
 Originally Posted by magi13 Here's another one. three girls went to a motel and rented a room for 30 \$ they each paid 10 \$. The owner realized that the price was only 25\$ and ordered his slave to return the 5 \$. The slave in turn gave one dollar each to the girls and kept the other 2 for donation. Now each of the girls paid 9 \$, multiply that by 3 = 27 +2(which the slave had) = 29. What happened to the 1 dollar?
In the end each girl pays \$8.33 & 1/3 cents. = \$25.00. Keep in mind there are two transactions here that need to be kept separate.

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