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The St. Mark's Community Barbecue served 250 dinners. A child's plate cost $3.50 and an adult's plate cost $7.00. A total of $1347.50 was collected. How many of each type of plate was served

  • algebra -

    child's plate --- x
    adult ----- 250-x


    3.5x + 7(250-x) = 1347.5

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