Mrs. Lopez needs to buy movie tickets for her husband, herself, her parents, and x children.
The cost of an adult ticket is $11.
The cost of a senior citizen ticket is $9.
The cost of a child ticket is $8.
Mrs. Lopez needs to buy 2 adult tickets (for herself and her husband), 2 senior citizen tickets (for her parents), and x child tickets.
The total cost of the adult tickets is 2 * $11 = $22.
The total cost of the senior citizen tickets is 2 * $9 = $18.
The total cost of the child tickets is x * $8 = $8x.
The total amount of money Mrs. Lopez needs to buy everyone's tickets is the sum of the costs of the adult, senior citizen, and child tickets: $22 + $18 + $8x.
We are given that the total amount of money needed is $64, so we can write: $22 + $18 + $8x = $64.
Simplifying the left side, we get: $40 + $8x = $64.
Subtracting $40 from both sides, we get: $8x = $24.
Dividing both sides by $8, we get: x = 3.
The value of x is 3.
#### 3
The answer is: 3
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Mrs. Lopez and her family are going to the movie theatre.  Adult tickets are $11.  Children’s tickets (ages 3-12) are $8.  Senior citizen’s tickets (ages 60+) are $9.  Mrs. Lopez needs to buy movie tickets for her husband, herself, her parents (ages 72 and 75), and her x children (ages 7, 10, 14).  How much money does she need to buy everyone’s tickets?
If we know the answer to the above question is 64, what is the value of unknown variable x?

### Answer:
