Based on the question they paid $12 in total for the movie. Also, that Michael's ticket cost $2 more than his brothers.
12 = n + n - 2
n = Michael's ticket.
Combine Like Terms.
12 = 2n - 2
Add 2 to both sides.
12 + 2 = 2n - 2 + 2
Simplify.
14 = 2n
Divide 2 to both sides.
14/2 = 2n/2
Simplify
7 = n
Now, we know what Michael's ticket cost, we can subtract it by 2 to find how much his brother's ticket costs.
$7 - $2 = $5
-------------
Option A is the correct answer.
-------------
Best Regards,
Wolfyy :)