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Bunuel
When it was found that 150 more tickets for the school play were sold than the seating capacity of the auditorium. It was decided to have two performances. if the total number of tickets sold was equal to the total number who attended and if the auditorium was 2/3 full for each of the two performances, what is the seating capacity of the auditorium?

(A) 100
(B) 200
(C) 225
(D) 300
(E) 450

We can let x = the seating capacity of the auditorium. So (x + 150) tickets were sold. There were 2 performances, each filling the auditorium at ⅔ capacity, so half of the total number of tickets sold is equal to 2/3 of the capacity of auditorium. Therefore, we have:

1/2(x + 150) = 2/3(x)

x/2 + 75 = 2x/3

Multiplying the equation by 6, we have:

3x + 450 = 4x

450 = x

Answer: E
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Bunuel
When it was found that 150 more tickets for the school play were sold than the seating capacity of the auditorium. It was decided to have two performances. if the total number of tickets sold was equal to the total number who attended and if the auditorium was 2/3 full for each of the two performances, what is the seating capacity of the auditorium?

(A) 100
(B) 200
(C) 225
(D) 300
(E) 450

We can let s = the number of seats in the auditorium and t = the number of tickets sold. We can create the equations:

s + 150 = t

and

(2/3)s = (1/2)t

Substituting s + 150 into the second equation for t, we have:

(2/3)s = (1/2)(s + 150)

2s/3 = s/2 + 75

Multiplying the equation by 6, we have:

4s = 3s + 450

s = 450

Answer: E
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