Easy problem; can't figure out equation

DexFroy

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Oct 16, 2015
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A teacher is taking his class to see a play. There are 24 students. The auditorium has 11 seats per row. There will be an adult placed at the beginning and end of each row, as well as after every 4 students. The teacher sits by himself. Including the teacher how many adults will be attending the play?

I believe the answer is 10, but I cannot figure an equation that works.
 
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