The price of the advance ticket is $40 and the price of the same day tickets is $30.
a + b = $70 equation 1
20a + 35b = 1850 equation 2
Where:
a = cost of one advance ticket
b = cost of one same day ticket
Multiply equation 1 by 20
20a + 20b = 1400 equation 3
Subtract equation 3 from equation 2
15b = 450
Divide both sides by 15
b = $30
Subtract $30 from $70.
$70 - $30 = $40
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