Final answer:
There are enough brownies for everyone to have two.
Step-by-step explanation:
To determine who is coming for dinner, we can use the given information. There are ten people at the dinner party and each person is served two brownies. So, the total number of brownies needed is 10 * 2 = 20 brownies. Since one guest brings 20 brownies for dessert, there are enough brownies for everyone to have two.