How many adult tickets were sold that day At the movie theatre child admission is $5.60 and adult admission is $9.90 on Tuesday 172 tickets were sold for a total sales of $1290.00.?

Let ( x ) be the number of adult tickets sold and ( y ) be the number of child tickets sold. We have two equations:

1. ( x + y = 172 ) (total tickets sold)
2. ( 9.90x + 5.60y = 1290 ) (total sales)

Substituting ( y = 172 - x ) into the second equation gives us ( 9.90x + 5.60(172 - x) = 1290 ). Solving this, we find ( x = 82 ) and ( y = 90 ). Therefore, 82 adult tickets were sold that day.