In a certain town, of each 100 men 85 are married, 70 have a telephone, 75 own a car, and 80 own their own house.
Always on a base of 100 men, what is the least possible number who are married, have a telephone, own a car, and own their own house?

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THE SOLUTION

15 are not married, 30 do not have a telephone, 25 do not have a car, 20 do not own their own house. It is possible that these 90 men are all different, which would leave only 10 men with wife, phone, car, and house.