Answer :
Answer:
110 students and 140 adults
Let adults be x and students be y
make equations:
1) x + y = 250
2) 2y + 4x = 780
make x the subject in equation 1:
- x + y = 250
- x = 250 - y
insert this in equation 2:
- 2y + 4(250 - y) = 780
- 2y + 1000 - 4y = 780
- 2y - 4y = 780 - 1000
- -2y = -220
- y = 110
So, there were total 110 students.
Find for x:
- x = 250 - 110
- x = 140
So, there were total 140 adults.