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From a survey of 100 college students, a marketing research company found that 70 students owned iPhones, 35 owned cars, and 25 owned both cars and iPhones. (a) How many students owned either a car or an iPhone (but not both)? b) How many students do not own either a car or an iPhone?


    Here are all the possibilties, with numbers of each:
    Cars and iPhones: 25
    iPhones only: 45
    Cars only: 10
    neither: 100 - 45 -25 -10 = 20

    a) 55 (one of either but not both)
    b) 20

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