12.5 gallons..............
For this case we give as data the following equation:

Where "x" represents the cost of a ticket.
By clearing the value of "x" of the equation we can know the cost of a ticket.
If we subtract 12 from both sides of the equation, we have:

If we divide between 4 on both sides of the equation:

Therefore, the cost of a ticket is $ 9.00
Answer:
Option C
To make 90 tortillas, he needs to make 6 batches. 6*15=90
2 cups masa per batch ->. 2 * 6=12 cups Masa
1.5 water per batch -> 1.5. * 6= 9 cups water
4x(3x + 8) - 7y(5x - 1) =
12x^2 + 32x - 35xy + 7y