At the movie theatre, child admission is 5.20 and adult admission is 8.30 . on thursday, three times as many adult tickets as child tickets were sold, for a total sales of 752.50 . how many child tickets were sold that day?

X=child     y=adult
1:  y=3x
2:  5.20x+8.30y=752.50

5.20x+8.30(3x)=752.50
x=25

y=3x
x=25
y=75

adult:75
child:25

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?