Annabelle spent 1/3 * $30 = $10 on junk food.
She then spent an additional $8 on sweets.
So, in total, Annabelle spent $10 + $8 = $18.
She received a weekly allowance of $30, and she spent $18, so she saved $30 - $18 = $12.
Therefore, Annabelle saved $12.
#### 12
The answer is: 12
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Annabelle collected a weekly allowance of $30. She spent a third of it buying junk food, then spent another $8 on sweets. Out of guilt she decides to save the rest. How much did she save?

### Answer:
