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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?

Respuesta :

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

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