Answer: 68 adult tickets were sold and 78 child tickets were sold.
Explanation:
a + c = 146 where a is the number of adults tickets sold and c is the numbe rof child tickers sold.
5.60 a+ 8.80c= 1067.20
a + c = 146
5.60a + 8.80c = 1067.20 solve by elimination.
a=68
c =78