Question 656343
A+C=280
OR
A=280-C
.60A+.25C=140
.60(280-C)+.25C=140
168-.60C+.25C=140
-.35C=140-168
-.35C=-28
C=-28/-.35
C=80 CHILDREN BOUGHT TICKETS.
A+80=280
A=280-80
A=200 ADULT BOUGHT TICKETS.
PROOF:
.60*200+.25*80=140
120+20=140
140=140