exam Maths Puzzle Numerical Ability

-3(4x-2)-2(5x-4)

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The student government can sell a total of 400 tickets to a basketball game. An adult ticket costs $3 and a student ticket costs $2. What is the minimum number of adult tickets that must be if the student government wants to collect at least $1100? What is the difference in parentheses versus brackets and when do you use each with regards to interval notation?