In a staff room of 25 teachers 13 drink black coffee 7 milk coffee 9 drink both tea and either ...........

Quantitative Aptitiude (CLAT) Number System

In a staff room of 25 teachers, 13 drink black coffee, 7 milk coffee, 9 drink both tea and either type of coffee, and everyone drinks either of the beverages. How many teachers drink only tea?

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