7 campers went rowing in the morning. Some more campers went rowing in the afternoon. If a total of 5 campers went rowing that day How many campers went rowing in the afternoon?
There were 7 campers rowing in the morning. 
Some more campers went rowing in the afternoon. 
A total of 5 campers went rowing that day. 

That means that 2 campers went rowing in the afternoon.