By C. R. Wylie Jr.
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Extra resources for 101 Puzzles in Thought and Logic (Math & Logic Puzzles)
If Nelson is the cashier, Miller is the clerk. If Nelson is the clerk, Miller is the accountant. If Miller is not the cashier, Lewis is the clerk. If Lewis is the accountant, Nelson is the clerk. What is each man's job? 46 Dick's work in mathematics had been on the borderline between A and B during most of the term, so one day just before examinations he stayed after class to ask his teacher what final grade he might reasonably expect. With Dick were two of his pals who had the same question in mind.
The poet was reading a play. The novelist, who was a very young man with only one book to his credit, boasted that he had never so much as opened a book of history in his life. Brown had brought one of Davis' books, and none of the others had brought one of his own books either What was each man reading, and what was each man's literary field? 21 Four black cows and three brown cows give as much milk in five days as three black cows and five brown cows give in four days. Which kind 0/ cow is the better milker, black or brown?
II the company actually needed more than one 01 the men, which ones were they? 43 Bertrand Russell in a whimsical moment once defined mathematics as" ... the subject in which we never know what we are talking about, nor whether what we are saying is true," and here is a puzzle of which the same thing might be said. As a simple exercise in abstraction suppose that four meaningless symbols A, B, C, and D correspond in one order or another to the equally meaningless symbols W, X, Y, and Z, and suppose further that If A is not X, then C is not Y.