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there are 26 times in Washington high school as teachers.when all the teachers and students are seated in the 900 seat school auditorium,only 9 seats are unoccupied. how many students are at Washington highschool

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Stayinup
So, I assume that you mean 26 students times the teachers. 
You can create two equations out of this information.
s = students while t = teachers
26t = s
900 - 9 = 891 seats being occupied
s + t = 891
You can use these two equations for substitution.
s = 891 - t
26t = 891 - t
27t = 891
t = 31
So, 31 teachers. Now plug that back into an original equation.
s + (31) = 891
s = 860
860 students.

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