During summer break 36 kids from Lawrence county go to camp and the other 25 kids stay home. An additional 16 kids from outside the county attended the camp. About how many kids are in Lawrence county?
There are a total of 61 kids who go to camp. 
36 of those kids are from Lawrence county, which means that 25 kids are from outside Lawrence county. 
That means that there are a total of 61-25 = 36 kids in Lawrence county.