At the city museum, child admission is $5.20 and adult admission is $8.90. on friday, 159 tickets were sold for a total sales of $1100.60. how many adult tickets were sold that day?

Total tickets sold = 159

Total sales = $1100.60

Child admission = $5.20

Adult admission = $8.90

Assumed all 159 tickets are Child admission tickets

Total sales = 159 x 5.2 = $826.80

Difference in amount = $1100.60 - $826.80 = $273.80

The difference must be contributed by the Adult Admission Tickets, which has a difference of $8.90 - $5.20 = $3.70

$273.80 : $3.70 = 74 adult tickets

159 - 74 = 85 child tickets