Danny collects bottle caps and wrappers. He found 1 bottle caps and 19 wrappers at the park. Now he has 34 bottle caps and 39 wrappers in his collection. How many bottle caps did danny have at first?
Danny finds 1 bottle cap and 19 wrappers. 

He now has 34 bottle caps and 39 wrappers in his collection. 

We want to know how many bottle caps he had at first. 

We can set up an equation to solve this: 

1 + 19 = 34 + 39 

20 = 73 

We know that Danny had 20 bottle caps at first.