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Systems of linear equations word problems: Level 2

At Charlie's Cinema, a total of 1,2001{,}200 adult and child movie tickets were sold to bring in $10,875\$10{,}875 in ticket sales one evening. If each child ticket costs $7.50\$7.50 and each adult ticket costs $10.00\$10.00, how many adult tickets were sold that evening?
  • Your answer should be
  • an integer, like 66
  • a proper fraction, like 1/21/2 or 6/106/10
  • an improper fraction, like 10/710/7 or 14/814/8
  • an exact decimal, like 0.750.75