At a recent cross country meet, spectators had to pay to get in. It cost $7 for adults and $3 for students. The Booster Club selling tickets forgot to keep track of how many adult and student tickets they sold. However, they did know they sold 155 total tickets and made $645. A) Write a system of equations to model this situation. Be sure to define your variables (write let statements) B) Determine how many adult tickets were sold.

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