ANSWER
$166.67
Step-by-step explanation
We have that the equation that Luis has used to represent the given situation is:
4(t + 25) = 4(t + 50) - 4(0.15t)
where t = price per ticket for which the two airlines have the same total cost
From the question, we have to find the ticket price, t.
We do that by simplifying the equation given.
That is:
4(t + 25) = 4(t + 50) - 4(0.15t)
Expand the bracket:
4t + 100 = 4t + 200 - 0.6t
Collect like terms:
4t - 4t + 0.6t = 200 - 100
0.6t = 100
t = 100 / 0.6
t = $166.67
That is the ticket price that satisfies the situation.