The vociferous objections on this sub-thread are rather amusing. It seems several people missed the bit where I said I was OK with the official solution at first, but kept being bothered about the problem construction. I doubt Andrew has any problem articulating the default 'correct' solution either. I was thinking about the problem construction anyway because I was annoyed that the problem as stated in Singapore includes several glaring errors of English grammar which were an annoying distraction, eg' I know that Bernhard does not know too' rather than '...does not know either.' English is an official language in Singapore so I was surprised that such obvious errors would be allowed to creep into a logic problem; it's akin to muddying up a mathematical equation with '-(-x)'.
That started me thinking outside the confines of the problem and about the implicit assumptions that were in the problem statement itself. The 'inability to piece everything together' is entirely imaginary on your part.
That started me thinking outside the confines of the problem and about the implicit assumptions that were in the problem statement itself. The 'inability to piece everything together' is entirely imaginary on your part.