Movie theatre

At the movie theatre, child admission is 5.40, and adult admission is 9.70. On Thursday, the theatre sold 159 tickets for a total sales of 1142.40. How many child tickets were sold that day?

Correct answer:

a =  93

Step-by-step explanation:

a+b=159 5.40 a+9.70 b=1142.40  a+b=159 5.4a+9.7b=1142.4  Pivot:Row1Row2 5.4a+9.7b=1142.4 a+b=159  Row25.41 Row1Row2 5.4a+9.7b=1142.4 0.8b=52.56  b=0.796296352.55555556=66 a=5.41142.49.7b=5.41142.49.7 66=93  a=93 b=66

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