[ARCHIVED THREAD] - Who can solve this math problem. (Page 1 of 2)
Posted: 4/15/2015 9:40:14 AM EDT
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Don't know if this has been posted yet. Did a search, but found nothing.
I even looked up the answer and was still like  .
http://www.theatlantic.com/education/archive/2015/04/the-math-question-that-went-viral/390411/ |
Here you go, extractr, since its so hard to post the content in your pathetic OP. Solution: Click To View Spoiler |
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Quoted:
He would not know the day. He would have narrowed it down to 2 from 10. Maybe I'm dumb, but I don't see how this is true, and the solution hinges on it. Quoted:
Out of ten dates, the day ranges from 14 to 19 with only 18 and 19 each occurring once. If the day of Cheryl's birthday is 18 or 19, the Bernard would have known when Cheryl's birthday is since Cheryl has told him the day of her birthday.
He would not know the day. He would have narrowed it down to 2 from 10. Maybe I'm dumb, but I don't see how this is true, and the solution hinges on it. If Albert is sure that Bernard doesn't know, then he knows for certain that he was not told 18 or 19. The only way he could know that is if he (Albert) was not told May or June. Hearing that Albert knows Bernard doesn't know, he now knows it's either July or August. The only way Bernard can know for sure now is if the number is 15, 16, or 17. This rules out 14. The only way Albert can now know for certain is if he has the month with one possibility (July) and not two (August), which leaves only July 16th. |
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Apparently you hail from Singapore! Quoted:
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July 16 Correct. It's actually not that hard of a problem. Apparently you hail from Singapore! Nah, I used to do those little drugstore logic puzzle books all the time. This is a logic problem, not a math problem. |
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Quoted:
It wasn't that hard, but it's amazing that they give that to 5th graders. I can remember doing puzzles like this in 4th/5th grade. Things like; Billy lives in a red house, his neighbor owns a dog, Mary has a blue car and prefers 1911 over Glock, ... Does Billy like beans in his chili? |
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Click To View Spoiler
Now, I'm going to check to see if I'm right. ETA: Dammit. So close. My reasoning broke down on the last step given in Skillshot's solution. 
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