Answer:
On Tuesday 8 adult tickets and 12 child tickets were sold.
Explanation:
Since the movie theater sells adult tickets for $ 10 and kids tickets for $ 8, and they sold $ 176 worth of tickets last Tuesday with a total of 20 ticket sales, to determine how many tickets of each type were sold, the following calculation must be performed:
10 - 8 = 2
20 x 8 = 160
176 - 160 = 16
16/2 = 8
8 x 10 + 12 x 8 = X
80 + 96 = X
176 = X
Therefore, on Tuesday 8 adult tickets and 12 child tickets were sold.