### Instruction: A family went out to see a movie. The regular ticket costs $9 and the ticket for children is $2 less. They gave the cashier two $20 bills and they received a $1 change. How many children are there if there are 2 adults in the family? Let's write a program.### Response: # define the variables
adult_ticket = 9
child_ticket = adult_ticket - 2
total_payment = 20 * 2
change = 1
adults = 2

# calculate total cost for adults
total_adult_cost = adults * adult_ticket

# calculate remaining money for children
remaining_money = total_payment - change - total_adult_cost

# calculate number of children
children = remaining_money / child_ticket

# print the result
print(int(children))