A car dealer sells two cars for $9,999 each — one at a 10% profit, the other at a 10% loss. Overall, did the dealer make or lose money? How many co...
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Multiplying my age by 6 then subtracting 6 produces the same result as subtracting 7 from my age then multiplying by 7. How old am I? On my broken ...
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In a foot race, Abe was neither first nor last. Cal beat Doug, Bruce beat Abe, Abe beat Ed but was beaten by Cal, and Doug beat Bruce. Who was last...
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Put your wits—and survival instincts—to the test! In Perilous Problems for Puzzle Lovers, Alex Bellos collects 125 of the world’s greatest stumpers...
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