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Science Forum

  1. 14 Apr '15 19:42 / 1 edit
    Here's a recreational mathematics problem that recently 'went viral':

    http://www.theguardian.com/science/alexs-adventures-in-numberland/2015/apr/13/can-you-solve-the-singapore-primary-maths-question-that-went-viral

    "Can you solve the maths question for Singapore schoolkids that went viral?"
    --Alex Bellos (13 April 2015)
    (The problem was given to the better 14-15 year old students in Singapore.)

    I solved it through a straightforward logical process-of-elimination.
    (My father gave me more complex logical problems when I was younger.)
    Have fun trying it before looking up a solution on the internet.
  2. Standard member forkedknight
    Defend the Universe
    14 Apr '15 21:30 / 1 edit
    Originally posted by Duchess64
    Here's a recreational mathematics problem that recently 'went viral':

    http://www.theguardian.com/science/alexs-adventures-in-numberland/2015/apr/13/can-you-solve-the-singapore-primary-maths-question-that-went-viral

    "Can you solve the maths question for Singapore schoolkids that went viral?"
    --Alex Bellos (13 April 2015)
    (The problem was given to t ...[text shortened]... problems when I was younger.)
    Have fun trying it before looking up a solution on the internet.
    Fairly straightfoward solution:

    Albert: "I don't know the date, and I know Bernard doesn't know it either"

    Albert knows that the month of the birthday cannot have a day in it that is unique, therefore, no May or June


    Bernard: "I didn't know before, but now I do."

    This eliminates the 14th as the day, leaving only July 16, August 15, and August 17


    Albert: "Then I also know the date"

    It must be July 16, since Albert could not have a solution if the day was in August
  3. 23 Apr '15 16:07
    Originally posted by forkedknight
    Fairly straightfoward solution:
    In fact, though the details are different, the essence of the solution is very similar to that of the famous smudged face problem.