At the city museum, child admission is $5.80 and adult admission is $9.10. On Friday, four times as many adult tickets as child tickets were sold, for a total sales of $1223.80. How many child tickets were sold that day?

Answer:The answer to your question is: 29 childrenStep-by-step explanation:Datachild = c = $5.8adult = a= $9.10adults = 4 childrenProcess                           9.1 a + 5.8 c = 1223.80Substitution                           9.1(4c) + 5.8c = 1223.80                           36.4 c + 5.8c = 1223.8                            42.2c = 1223.8                            c = 1223.8 / 42.2                            c = 29adults                            adults = 4(29)                            adults = 116