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Start here => Games => Topic started by: sg1008 on April 14, 2015, 08:41:41 PM

Title: math logic problem (singapore)
Post by: sg1008 on April 14, 2015, 08:41:41 PM: Hint: It's actually simpler than people think. Imagine ALbert and Bernard are having their conversation as they are looking at the list of dates together.

(http://i.guim.co.uk/static/w-620/h--/q-95/sys-images/Guardian/Pix/pictures/2015/4/13/1428911196726/be00992c-012d-4216-9e7a-2751a79c75c4-620x372.jpeg)
Title: Re: math logic problem (singapore)
Post by: Pyraxis on April 14, 2015, 08:46:58 PM: July 16th

Amirite?
Title: Re: math logic problem (singapore)
Post by: sg1008 on April 14, 2015, 08:52:25 PM: Hm... actually I am second guessing myself. lol... due to the word "respectively"
Title: Re: math logic problem (singapore)
Post by: sg1008 on April 14, 2015, 08:56:30 PM: Quote from: Pyraxis on April 14, 2015, 08:46:58 PM
July 16th

Amirite?

You are right!
Title: Re: math logic problem (singapore)
Post by: sg1008 on April 14, 2015, 08:57:29 PM: Okay lets do it in reverse: now do the problem if Albert knew the day and Bernard knew the month...
Title: Re: math logic problem (singapore)
Post by: Gopher Gary on April 14, 2015, 08:59:57 PM: Quote from: Pyraxis on April 14, 2015, 08:46:58 PM
July 16th

Amirite?

You're a freaking genius. :o
Title: Re: math logic problem (singapore)
Post by: sg1008 on April 14, 2015, 09:08:58 PM: Quote from: Gopher Gary on April 14, 2015, 08:59:57 PM
Quote from: Pyraxis on April 14, 2015, 08:46:58 PM
July 16th

Amirite?

You're a freaking genius. :o

She is. ;)
Title: Re: math logic problem (singapore)
Post by: Gopher Gary on April 14, 2015, 09:13:22 PM: Hey, no fair, I'm trying to flirt with Pyraxis. >:(
Title: Re: math logic problem (singapore)
Post by: Icequeen on April 14, 2015, 09:18:00 PM: Okay...now please explain it for the mentally handicapped over here.
Title: Re: math logic problem (singapore)
Post by: sg1008 on April 14, 2015, 09:28:14 PM: Quote from: Gopher Gary on April 14, 2015, 09:13:22 PM
Hey, no fair, I'm trying to flirt with Pyraxis. >:(

But I'm trying to flirt with you... :eyebrows:
Title: Re: math logic problem (singapore)
Post by: Gopher Gary on April 14, 2015, 09:31:40 PM: Quote from: sg1008 on April 14, 2015, 09:28:14 PM
Quote from: Gopher Gary on April 14, 2015, 09:13:22 PM
Hey, no fair, I'm trying to flirt with Pyraxis. >:(

But I'm trying to flirt with you... :eyebrows:
:eyelash:
Title: Re: math logic problem (singapore)
Post by: Gopher Gary on April 14, 2015, 09:33:05 PM: Quote from: Icequeen on April 14, 2015, 09:18:00 PM
Okay...now please explain it for the mentally handicapped over here.

I had to look it up and thought this was the best explanation I saw. http://www.nytimes.com/2015/04/15/science/answer-to-the-singapore-math-problem-cheryl-birthday.html (http://www.nytimes.com/2015/04/15/science/answer-to-the-singapore-math-problem-cheryl-birthday.html)
Title: Re: math logic problem (singapore)
Post by: sg1008 on April 14, 2015, 09:38:23 PM: Quote from: Icequeen on April 14, 2015, 09:18:00 PM
Okay...now please explain it for the mentally handicapped over here.

Cheryl tells Albert and Bernard separately the month and day of her birthday respectively.
This means that Albert knows the month, and Bernard knows the day.

So...they are looking at the list of dates Cheryl provided and Albert (who knows the month) says: "I don't know when Cheryl's birthday is, but I know that Bernard does not know too."

What month could Cheryl have told Albert that he would deduce the above statement from?
Well, if the only way Bernard would know the date is if the day that Cheryl told him was unique (never repeated). The only days not repeated are 18 and 19. The months with those days are May and June, and since Albert is sure Bernard does not know the day, we can assume that the month Cheryl gave Albert was NOT May or June.

So we rule out May and June dates.

Then Bernard (who knows the day) says: "At first I don't know when Cheryl's birthday is, but now I do."

If he is sure about the day of Cheryl's birthday that must rule out the number 14, because that day is repeated. So now we just have the options of July 16, August 15, & August 17.

Then Albert (who only knows the month) says: "Then I also know when Cheryl's birthday is".

Since Albert only knows the month, the only way he could be sure is if the month is July, since august has two options.

So Cheryl's birthday is July 16.
Title: Re: math logic problem (singapore)
Post by: sg1008 on April 14, 2015, 09:52:16 PM: Now solve it the other way, if Albert knew the day and Bernard knew the month.
Title: Re: math logic problem (singapore)
Post by: Icequeen on April 14, 2015, 10:03:22 PM: My brain hurts.

I say we tie Cheryl up and slap her for being a game playing little bitch. :zoinks:
Title: Re: math logic problem (singapore)
Post by: sg1008 on April 14, 2015, 10:22:14 PM: Quote from: Icequeen on April 14, 2015, 10:03:22 PM
My brain hurts.

I say we tie Cheryl up and slap her for being a game playing little bitch. :zoinks:

:lol1:
Title: Re: math logic problem (singapore)
Post by: sg1008 on April 14, 2015, 10:22:48 PM: Quote from: Gopher Gary on April 14, 2015, 09:31:40 PM
Quote from: sg1008 on April 14, 2015, 09:28:14 PM
Quote from: Gopher Gary on April 14, 2015, 09:13:22 PM
Hey, no fair, I'm trying to flirt with Pyraxis. >:(

But I'm trying to flirt with you... :eyebrows:
:eyelash:

:squiddy: