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Mathematics 7 Online
OpenStudy (anonymous):

A survey of 1200 people says that in a city there are people that own 840 microwaves, 750 own dvd players, and 600 additional own both. 1. how many people own a microwave or dvd 2. how many people own neither 3. how many people own microwave but not Dvd How do I start this one?

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