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Tickets to a concert cost $10 in advance and $15 at the door. If 120 tickets were sold for a total of $1390, how many of the tickets were purchased in advance?

Respuesta :

ColeS1212
82 tickets paid in advance
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texaschic101

Answer:

Step-by-step explanation:

10a + 15d = 1390

a + d = 120.....d = 120 - a

10a + 15(120 - a) = 1390

10a + 1800 - 15a = 1390

-5a + 1800 = 1390

-5a = 1390 - 1800

-5a = - 410

a = -410 / -5

a = 82 <==== advance tickets

a + d = 120

82 + d = 120

d = 120 - 82

d = 38........door tickets

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