SOLUTION: there are 20 people in a room. 8 of them are wearing socks and 13 of them are wearing shoes. 4 people are wearing both.how many are barefooted?

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Question 141972: there are 20 people in a room. 8 of them are wearing socks and 13 of them are wearing shoes. 4 people are wearing both.how many are barefooted?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
there are 20 people in a room. 8 of them are wearing socks and 13 of them are wearing shoes. 4 people are wearing both.how many are barefooted?
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Draw a Venn diagram with two overlapping circles.
Call one circle Socks and the other Shoes.
Put a 4 in the overlap
Put a 4 in the Socks that is not in the overlap
Put a 9 in the Shoes that is not in the overlap
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The circles now contain 4+4+9 = 17.
So, there are 3 who are barefooted.
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Cheers,
Stan H.