A survey is given to 100 potential customers. 80 responded that they own an Xbox, 20 responded

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Question:

A survey is given to 100 potential customers. 80 responded that they own an Xbox, 20 responded that they own a PlayStation, and 15 responded that they own neither an Xbox nor a PlayStation. How many own both a PlayStation and an Xbox? (It may help to draw a Venn diagram, but it’s not required)