algebra
posted by Denise .
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

child's plate  x
adult  250x
solve
3.5x + 7(250x) = 1347.5