iMath | Community

KL Gan

Asked 9 years ago

Anyone can solve this logic question which is currently over the facebook?

Replies 3

Boey Wai Yen

Already been discussed a couple of days ago. Scroll down further. Posting the link here. Look at the comments for the solution. https://m.facebook.com/photo.php?fbid=10152877809754426&id=550514425&set=gm.449635138526481&source=48

5 years ago

Boey Wai Yen

5 years ago

Boey Wai Yen

5 years ago

Yaung Yin

Asked 9 years ago

Replies 4

BA Poh Ann

5 years ago

Yaung Yin

Many thanks BA Poh

5 years ago

BA Poh Ann

You're welcome! :D

5 years ago

Soo Vei Li

By drawing models....

5 years ago

Eugene Ng Ming Teck

Asked 9 years ago

Try this. Logic question.

Replies 7

Siew Ping Chung

July 16 http://mathforum.org/library/drmath/view/68613.html

5 years ago

Siew Ping Chung

Day 18 and 19 are ruled out as they appeared once. May and June also ruled out as day 18 and 19 appear on these months. Cannot be day 14 which appears in July and August. Cannot be August as Albert who knows the month but would not know if it is 15 or 17. Thus it can only be July 16.

5 years ago

Boey Wai Yen

Wow! Thanks so much for the question and a very clear explanation of the answer.

5 years ago

Carine Lee

Was this a qn that came out in one of the school's test/exam papers?

5 years ago

Boey Wai Yen

I modified the explanation in the article to suit this question, as the first part of the article could be confusing. Hope it helps. <At Step 1, we know Albert does not know the answer, since each possible month has more than one day, and nothing else has been said. But from Albert's first statement, he also says that Bernard could not know the answer either, which removes unique dates 18 & 19. But in removing the unique dates, Albert (knowing only the month of the birthday) is also saying that he knew that the answer couldn't be June 18 nor May 19, and this also rules out the months in which these days appear, ie, May & June At Step 2, Bernard confirmed that he did not know the answer at first, but now that he knows that the month is either July or August, it is enough for him to deduce the answer. This means that the day (which is what Bernard knows) must appear exactly once in July or August, which leaves 15, 16 and 17. At Step 3, Albert has learned that the day is 15, 16 or 17, and that is enough for him to know the answer. This means that exactly one of these days can appear in the month (known to Albert), which ruled out August (as it had 2 possible dates), leaving only 16 July as the answer.>

5 years ago