Allan brought 12 balloons and Jake brought 18 balloons to the park. Jake then bought 23 more balloons at the park. How many more balloons did Jake have than Allan in the park?
Allan brought 12 balloons and Jake brought 18 balloons to the park. 

That means Jake had 6 more balloons than Allan to start. 

Jake then bought 23 more balloons at the park. 

That means Jake had a total of 29 more balloons than Allan.