Question

Hardest Question Ever... Please Help

Answer 1

post the question

Answer 2

goodness this IS hard

Answer 3

LOL i know i really need help.. @iGreen

Answer 4

@AnswerMyQuestions @cherry18 @dan815 @iambatman @iGreen @nincompoop

Answer 5

Whhhhaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaatttt?

Answer 6

Sorry can't help you this is confusing

Answer 7

. . .

This makes no sense whatsoever..

Answer 8

http://www.msn.com/en-us/news/us/the-math-question-that-went-viral/ar-AAb0wHo
If you think you kneow how to do this tell me

Answer 9

How can you find out her birthday when given 10 possible dates?

Answer 10

It gives no hints whatsoever

Answer 11

That's poor english too..

Answer 12

LOL I know right?

Answer 13

"At first I don't know when Cheryl's birthday is, but I know now."

Answer 14

its cause its from singapore... did you read the article

Answer 15

LOL right?!?

Answer 16

It gives you a hint..it tells you to find out what Albert knows..(in the article)

But it doesn't say that in the question.

Answer 17

I'm leaving..this is stupid -.-

Answer 18

OOOHHHH makes sense now... but I still don't know Cheryl's birthday... if you find it out, please tag me in a post or message me... I need to know her birthfay!

Answer 19

Gee, seen this problem before. I can find solution, or at least explanation on how to solve it.

Answer 20

http://mothership.sg/2015/04/p5-logic-question-is-actually-a-math-olympiad-question-for-sec-3-and-4-students/

Answer 21

Are you interesting in see solution?

Answer 22

Yes

Answer 23

That website tells you the solution, the one I gave. LOL

Answer 24

http://cdn.mothership.sg/wp-content/uploads/2015/04/SASMO-Question-solution.jpg

Answer 25

"Let A = Albert and B = Bernard. Also, taking May 15 as an example, May 15 is the date, May is the month and 15 is the day.

'Albert: I don't know when Cheryl's birthday is, but I know that Bernard does not know too.'

This statement implies that A with 100% certainty knows that B does not know the date. So we get two bits of information, B does not know the date, and A knows that B does not know the date.

When does B not know the date? If he knows the day is 18 or 19, he can easily figure out the date. For 14/15/16/17, there are two possible choices so he can't know the date. Since B does not know the date, we can eliminate May 19 and June 18.

Now, how is A 100% sure that B doesn't know the date? We showed that if the date was May 19 and June 18, then B will know the date. So if the month known to A was May or June, than A could not say with 100% certainty that B does not know the date. So the only dates left are the ones in July and August.

~Bernard: At first I don't know when Cheryl's birthday is, but I know now.

Using the same reasoning we did, B now knows that the month is July or August. If the day he knew was 14, then he would still be stuck with July 14/August 14. So 14 is not possible. So the three choices left are July 16, August 15, August 17.

~Albert: Then I also know when Cheryl's birthday is.

Using the same reasoning we did, A knows that there are only 3 dates left. If the month know to A was August, then he couldn't have figured out the date, since there are two possible choices, August 15/August 17. So the month A knows is July, giving the only possible date of \(\boxed{\text{July 16}}\)"

Answer 26

LOL

Answer 27

If anyone want, here's the source of solution: https://brilliant.org/problems/birthday-girl/?group=HrRYN794KPgd&ref_id=722473

Answer 28

WHAT THE HECK?!?!?!?!?!?!?! GEEZ!??!? what grade you in?

Answer 29

He's in like 6th or 7th lol

Answer 30

I am in 7th I have had that hard yet.