In Exercises 33-11, use the four-step strategy to solve each problem. Use x, y, and z to represent unknown quantities. Then translate from the verbal conditions of the problem to a system of three equations in three variables.
At a college production of A Streetcar Named Desire.-400 tickets were sold. The ticket prices were $8. $10. and $12and the total income from ticket sales was $3700. How many tickets of each type were sold if the combined number of $8 and $10 tickets sold was 7 limes the number of $12 tickets sold?
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