You have 12 golf balls numbered 1 to 12, with all balls looking alike
in every way except 1 ball is slightly heavier or lighter than the others.
You also have one balance scale (looks like a teater-totter). You can
only use the scale three times, identify which ball is different and
whether it is heavier or lighter.
If all Ferpies are Worgs and no Worgs are Sprikles,
then no Sprikles are definitely Ferpies.
Three enemy messages were intercepted. The code
was broken and it was found that "Berok tenlis krux" means "Secret
Attack on Wednesday" and Baroom zax Tenlis" mean "Secret plans
included" and "Gradnor berok plil elan" means "Wednesday victory
is ours." What does "krux" mean?