At the city museum, child admission is $5.10 and adult admission is $8.20 . On Thursday, four times as many adult tickets as child tickets were sold, for a total sales of $1174.90 . How many child tickets were sold that day?

Respuesta :

(4x$8.20)+$5.10=$37.90 (1 set)
$1174.90÷$37.90=31 (no.of sets)
31x1=31 (child tickets: 1u per set)

Ans: 31