Four siblings—Dan, Eli, Fay, and Guy—were born in four different years: 2000, 2002, 2005, and 2008, though not necessarily in that order. - Dan is older than Fay. - Eli was born in an even year and is younger than Guy. - Guy was not born in 2000. In what year was Eli born?
2008
Available years are 2000, 2002, 2005, 2008. Eli was born in an even year (2000, 2002, or 2008) and is younger than Guy. Guy was not born in 2000, so Guy could be 2002, 2005, or 2008. Since Eli is younger than Guy, Eli must be born after Guy. The only even year left for Eli that allows someone to be older is 2008 (with Guy in 2005, wait, 2005 is odd). Let's trace carefully: Eli is even (2000, 2002, 2008). Guy is not 2000. If Guy is 2002, Eli could be 2008. If Guy is 2005, Eli could be 2008. Since Dan > Fay and Eli < Guy, let's test Eli = 2008 (the youngest possible even year). If Eli is 2008, Guy must be older than Eli, so Guy is 2000, 2002, or 2005. But Guy is not 2000, so Guy is 2002 or 2005. This fits!
About this riddle
Logic riddles give you a few facts and ask what must be true. List what you know, cross out what cannot be, and see what is left.
Difficulty: Hard. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
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