If there is 3 people going to the theme parks and 4 or more people coming how much would it be

figure 100$ per person

If any are military, or retired military, the whole group can get the military discount, available at most base "Tickets and Tours" office. The discount can be as much as 50%. Full retail price, as of today, is $345 for a 3-park, 4-day pass. Plus up to $30 for parking.

Is this a crazy math question? Are the three people on a train going West by chance?

The price is the same. There are no discounts unless you buy the Florida resident pass available to Florida residents only. Sometimes they have specials where you can buy several day pass at a fair price.