Mathematics, 12.03.2020 06:23, loveagirl111puppy

22. In a survey of 26 instructors, it was found that 11 liked whiteboards, 18 like blackboards, and 8 liked both. How many instructors like whiteboards only? How many instructors liked blackboards only? How many instructors liked neither?

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22. In a survey of 26 instructors, it was found that 11 liked whiteboards, 18 like blackboards, and...