Respuesta :

mathstudent55

Answer:

420

Step-by-step explanation:

Let x = number of $40 tickets.

Let y = number of $60 tickets.

x + y = 700

40x + 60y = 33600

-40x - 40y = -28000

20y = 5600

y = 280

x + y = 700

x + 280 = 700

x = 420

Answer: 420 $40 tickets were sold

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