Allan brought 5 balloons and Jake brought 42 balloons to the park. Jake then bought 13 more balloons at the park. How many more balloons did Jake have than Allan in the park?
Allan brought 5 balloons to the park.
Jake brought 42 balloons to the park.

So Jake has 37 more balloons than Allan at this point. 

Jake then bought 13 more balloons at the park.

So Jake has 50 more balloons than Allan in the park.