question archive In a survey of 31 instructors, it was found that 23 liked whiteboards, 16 liked blackboards, and 10 liked both

In a survey of 31 instructors, it was found that 23 liked whiteboards, 16 liked blackboards, and 10 liked both

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In a survey of 31 instructors, it was found that 23 liked whiteboards, 16 liked blackboards, and 10 liked both. How many instructors like whiteboards only? How many instructors liked blackboards only? How many instructors liked neither? 

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