12 campers went rowing and 4 campers went hiking in the morning. 46 campers went rowing in the afternoon. How many campers went rowing and hiking in all?
In the morning, 12 campers went rowing and 4 went hiking. 
In the afternoon, 46 campers went rowing. 

How many campers went rowing and hiking in all? 

We can see that the number of campers who went rowing in the morning and afternoon is 12 + 46 = 58. The number of campers who went hiking in the morning and afternoon is 4 + 0 = 4. 

Therefore, the number of campers who went rowing and hiking in all is 58 + 4 = 62.