I often struggle with puzzles… not this one. https://twitter.com/davidwees/status/544490638948196352/photo/1
Four digit number : k h t u (why those letters? ;))
Product of digits is not 0. (Fast conclusion: no digits zero.)
tu = h — very limited possibilities; product still has to be 9 or fewer but… that doesnt’ get me an answer. (Yes, I’m already using the teachable strategy: find *one* of ’em and build from that. )
Only odd digit = k … could be useful…
t + l = k
t is a square number — OKAY, here’s my starting point… that’s limited to 1, 4, or 9… and since it has to be even, it’s 4. Puzzle over.. then k is 5…
None of my digits are the same
I’m greater than 5000.
—————–
So: 5_4_ U must be 2 b/c it has to be even, so h must be 8. (last two ‘clues’ seem superflous…)
5842
… Of course, this has me pondering why this is “fun” for me — how much does working memory and extreme automaticity of basic things (evenness of numbers, that ‘answers’ have to be from 1-9 and ease of testign all possibilities without brain strain…)
… but I vowed to make an effort to dive into Desire2Lrn today, since classes and finals are over and student traffic will be minimal, so onward!
Posted on December 15, 2014
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