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?

By #3, if Granny is an Engineer, then either the Father

or Son is the Doctor, but that violates #1. Also if Mom

is an Engineer, then the son is a Doctor, which also

violates #1. Neither Granny, nor Mom is an Engineer.

The son, who is younger than everyone and a blood

relative of everyone, cannot be an Engineer because that

violates #2.

Granny cannot be a Doctor, because the Father is younger,

and that would violate #2.

If Mom is the Engineer, that violates #3, because she and

her hubby must be related.

Therefore, the Son X is the Doctor, and Father X is the

Engineer.

Posted by Lawrence on 2003-08-28 21:53:57