At the movie theatre, child admission is $5.10 and adult admission is $9.00 . On Wensday, twice as many adults tickets as child tickets were for a total of $831.60. How many child tickets were sold that day?
+781 Let x be the number of child tickets sold and 2x the number of adult tickets sold.
We form an equation for the total money:
5.1x+9(2x)=831.6
5.1x+18x=831.6
23.1x=831.6
x=36 child tickets
