Answer:
12x + 16y = 3700
x + y = 250
x = 75 students
y = 175 adults
Explanation:
y = 250 - x
12x + 16(250-x) = 3700
12x + 4000 - 16x = 3700
-4x = -300
x = 75
y = 250 - 75
y = 175
3.5m questions
4.4m answers