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At the movie theatre, child admission is $5.70 and adult admission is $9.40. On Sunday, 135 tickets were sold for a total sales of S1080.30. How many adult
tickets were sold that day?

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Answer:

84 adult tickets

Explanation:

Let 'a' represent the number of adult tickets sold. Then (135-a) is the number of child tickets sold, and total revenue is ...

5.70(135 -a) +9.40(a) = 1080.30

3.70a = 310.80 . . . . . . . . subtract 769.50 and simplify

a = 310.80/3.70 = 84

84 adult tickets were sold on Sunday.

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