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 Doctor and Engineer (Posted on 2003-08-25)
One of Mr. X, his wife, their son and Mr. X's mother is an Engineer and another is a Doctor.
1. If the Doctor is a male, then the Engineer is a male.
2. If the Engineer is younger than the Doctor, then the Engineer and the Doctor are not blood relatives.
3. If the Engineer is a female, then she and the Doctor are blood relatives.
Can you tell who is the Doctor and the Engineer?

 Submitted by Ravi Raja Rating: 3.0000 (5 votes) Solution: (Hide) Mr. X is the engineer and either his wife or his son is the Doctor. Mr. X's wife and mother are not blood relatives. From 3, then, if the engineer is a female, the doctor is a male. However, from 1, if the doctor is a male, then the engineer must be a male. Thus, there is a contradiction, and the engineer cannot be female (either Mr. X or his son is the engineer). Mr. X's son is the youngest of all four and is blood relative of each of them. So, from 2, Mr. X's son is not the engineer. Hence, Mr. X is the engineer. Now, Mr. X is the engineer, and obviously he is both younger than his mother and a blood relative to her. From 2, then, Mr. X's mother can not be the doctor. So the Doctor is either his wife or his son. It is not possible to determine anything further, or eliminate either of these possiblities. Also, it does not even mater (for statement 2) if Mr. X or his wife are younger or older, as either way they are not blood relatives.

Comments: ( You must be logged in to post comments.)
 Subject Author Date Ambiguous Case anyone? Mike C 2007-08-30 14:57:41 but wait cat 2003-08-29 18:59:04 re: (All in the family) Lee 2003-08-29 00:22:19 All in the family Lawrence 2003-08-28 21:53:57 re: Hmm... Charlie 2003-08-28 08:42:52 Hmm... dmm 2003-08-28 02:06:45 solution Lee 2003-08-28 01:00:09 re: Solved Charlie 2003-08-27 20:06:27 re: Solution catherine 2003-08-27 16:15:44 Solved richard 2003-08-27 14:44:52 solution Anna 2003-08-27 13:50:32 No Subject catherine 2003-08-26 20:58:30 re: I have real solution!!! Charlie 2003-08-26 08:53:15 re: solution Charlie 2003-08-26 08:51:15 re: the REAL solution, oops Charlie 2003-08-26 08:49:02 the REAL solution, oops sandy 2003-08-26 07:41:06 the REAL solution sandy 2003-08-26 07:39:18 solution Steven 2003-08-26 02:46:44 re: Blood Relative? DJ 2003-08-25 22:58:42 Blood Relative? Gamer 2003-08-25 22:48:57 I have real solution!!! paul 2003-08-25 22:02:10 Solution DJ 2003-08-25 10:44:55 solution Charlie 2003-08-25 09:18:50 No Subject Jenna 2003-08-25 09:14:46

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