Danny collects bottle caps and wrappers. He found 46 wrappers and 50 bottle caps at the park. Now he has 21 bottle caps and 52 wrappers in his collection. How many more bottle caps than wrappers did danny find at the park?
Let's denote the number of bottle caps Danny found at the park by b, and the number of wrappers by w. 

Then we have the following system of two equations with two unknowns: 

b+w=96
b-w=29

We can solve this system using different methods. For example, we can add the equations: 

2b=125
b=125/2=62.5

Then we can substitute this value of b into the second equation: 

62.5-w=29
-w=-33.5
w=33.5

Therefore, Danny found 62.5 bottle caps and 33.5 wrappers at the park. The difference between the number of bottle caps and the number of wrappers is 

62.5-33.5=29 

Therefore, Danny found 29 more bottle caps than wrappers at the park.