6 campers went rowing and 19 campers went hiking in the morning. 41 campers went rowing in the afternoon. How many campers went rowing and hiking in all?
There are a total of 41 campers who went rowing in the afternoon. 
6 campers went rowing in the morning, which means that 35 campers went rowing in the afternoon. 
19 campers went hiking in the morning, which means that 22 campers did not go hiking in the morning. 

Now we can put this information together to solve the problem: 

6 campers went rowing and hiking in the morning. 
35 campers went rowing in the afternoon. 
22 campers did not go hiking in the morning. 

This means that a total of 41 + 6 - 22 = 25 campers went rowing and hiking in all.