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 say that the number of children who got on the bus at the bus stop is x. 

The number of children who were on the bus originally is 28. 

The number of children who were on the bus after the bus stop is 30. 

This means that the number of children who got off the bus is 2. 

Now we can write an equation: 

28 + x = 30 

x = 2 

This means that 2 more children got on the bus than those that got off.