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Sagot :


Let the number of adult tickets be x
Let the number of child tickets be y

a)Number of tickets sold:
x + y = 800

Dollar value of tickets sold:
5x + 3y = 3600


b) y = 800 - x

5x + 3y = 3600
5x + 3(800 - x) = 3600
5x + 2400 - 3x = 3600
5x - 3x = 3600 - 2400
2x = 1200
x = 1200/2
x = 600

Total number of adult tickets sold = 600