28 children were riding on the bus. At the bus stop 82 children got on the bus while some got off the bus. Then there were 30 children altogether on the bus. How many more children got on the bus than those that got off?

Let's call the number of children that got off the bus x. Then, the number of children that got on the bus is (x + 8). 

We know that the number of children that got on the bus is two times the number of children that got off the bus. Therefore, we write the following equation:

2 * (x + 8) = 2x + 16

We solve the equation for x and we get:

x = 8

Therefore, 8 more children got on the bus than those that got off.