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The tickets for the field trip were purchased yesterday for both students and instructors. Children tickets cost $11, adult tickets cost $18. The number of

The tickets for the field trip were purchased yesterday for both students and instructors. Children tickets cost $11, adult tickets cost $18. The number of children tickets purchased was five less than twice the number of adults tickets purchased. How many of each were purchased if all of the tickets cost a total of $945 dollars?

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