How many of those surveyed owned only a smart phone


Question: A survey was taken of 100 customers leaving a retail store and they were asked if they owned a Smart Phone, if they owned a Computer Tablet, and if they owned both a Smart Phone and a Computer Tablet. 70 said they owned a Smart Phone, 30 said they owned a Tablet, and 10 said they owned a both a Smart Phone and a Tablet. How many of those surveyed owned only a Smart Phone?

 

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