Give a quick stream of consciousness before answering the following question. In a recent survey 40% houses contained two or more people. Of those houses containing only one person 25% were having only a male. What is the percentage of all houses which contain exactly one female and no males?\nOptions:\n(A) 75\n(B) 40\n(C) 15\n(D) Cannot be determined\n(E) None of these
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Houses containing only one person = 100 – 40 = 60%\nHouses containing only a male = 60 × 25⁄100 = 15%\n∴ Houses containing only one female = 60 – 15 = 45%
The answer: (E).
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