At the city museum, child admission is $5.20 and adult admission is $8.30 . On Monday, three times as many adult tickets as child tickets were sold, for a total sales of $1173.90
Let # of child tickets = c # of adult tickets = 3c 3c (8.30) + c (5.20) = 1173.90 24.9c + 5.2c = 1173.90 30.1c=1173.90 c=39 tickets 3c=39x3= 117 tickets Therefore, 39 child tickets and 117 adult tickets were sold on monday, thus, a total of 156 tickets were sold.
