SOLUTION: In a certain group of computer personnel, 65% have insufficient knowledge of hardware, 45% have inadequate idea of software & 70% are in either one or both of the two categories. W

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Question 522060: In a certain group of computer personnel, 65% have insufficient knowledge of hardware, 45% have inadequate idea of software & 70% are in either one or both of the two categories. What is the percentage of people who do not know software among those who have a sufficient knowledge of hardware?
Answer by stanbon(75887) About Me  (Show Source):
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In a certain group of computer personnel, 65% have insufficient knowledge of hardware, 45% have inadequate idea of software & 70% are in either one or both of the two categories. What is the percentage of people who do not know software among those who have a sufficient knowledge of hardware?
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P(know soft |no hard) = P(soft AND hard)/P(hard) = 0.30/0.35 = 6/7
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Cheers,
Stan H.
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