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A survey of 200 people in a community who watched at least one of the three channels — BBC, CNN and DD — showed that 80% of the people watched DD, 22% watched BBC, and 15% watched CNN.What is the maximum percentage of people who can watch all the three channels?
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By: anil on 05 May 2019 02.32 am
Let a be the number who watch only one channel, b be the number who watch only 2 channels and c be the number who watch all channels. a+b+c = 100 a+2b+3c = 80+22+15 =117 Subtracting both equations, b+2c = 117-100 = 17 Maximum c occurs when b = 0 2c = 17 c = 8.5
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