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ramy_d
on April 13, 2015
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A maths question for Singapore schoolkids
This is correct. Although this is how we solve the problem, how did B know? that's where problems like these bug me.
_bfhp
on April 13, 2015
[–]
B knows because B had the information "16th", and "16th" is unique among the July and August dates.
cafard
on April 13, 2015
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parent
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Quite, but B could have easily known "15th" or "17th" for all that A knows in this particular part of the story.
rwbhn
on April 13, 2015
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root
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Nope, A knows July from the beginning - which rules those out. We, the readers, don't know that until A's final stmt.
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