In order to solve for the number of adults and students, we'll have to create a few variables.
's' will stand for students and 'a' will stand for adults.
We can make two equations with what we've been given:
4s + 8a = 1808
s + a = 325
We can use the subtraction method in order to solve this equation. Multiply the second equation by -4 (We do this in order to isolate one of the variables):
4s + 8a = 1808
-4s - 4a = -1300
____________
4a = 508
We simply added the two equations together. Divide both sides by 4 and:
a = 127
Now that we know the number of adults who attended, we can input this variable into the second equation:
s + a = 325
s + 127 = 325
s = 198
127 adults attended and 198 students attended.