15 campers went rowing in the morning. Some more campers went rowing in the afternoon. If a total of 32 campers went rowing that day how many campers went rowing in the afternoon?
There were 15 campers rowing in the morning. 

Then, some more campers went rowing in the afternoon. 

We know that a total of 32 campers went rowing that day. 

So, if we subtract the number of campers who went rowing in the morning from the total number of campers who went rowing that day, we will be left with the number of campers who went rowing in the afternoon. 

32 - 15 = 

17