Mr. Smith was murdered in Kansas City. The police determined that the time of death was
between 11:10 pm and 11:30 pm. Four suspects were questioned: Butler, the butler; Cook,
the cook; Ruby, the maid; and Irma, Mr. Smith’s secretary.
The suspects made the
Butler: I did not do it. Irma did it. Mr. Smith was blackmailing Irma. Ruby and I were
watching television together from 10:10 p.m. until 12:30 a.m.
Cook: I am innocent. Irma was being blackmailed. Butler murdered Mr. Smith. I saw
Irma leave the house at 10:00 p.m.
Ruby: I am innocent. Butler and I were watching television together at the time of the
murder. Irma was being blackmailed. I saw Irma speaking to Mr. Smith at 9:30
p.m. on the night of the murder.
Irma: I did not kill Mr. Smith. I was not being blackmailed. I was in St. Louis during
the entire night of the murder. Ruby is the murderess.
If each suspect made exactly two true statements and told exactly two lies, determine who
killed Mr. Smith.
(In reply to Adding one condition
After "who killed Smith." the following sentence should be added:
The police knew from their sources that the murderer was one of the four suspects and that he/she acted alone.
Thanks, Ollie for your just and well-needed remark.
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