If Joey plans to take a break after completing 70% of the assigned pages, he will read 30 * 0.70 = 21 pages before taking the break.
Therefore, Joey will have 30 - 21 = 9 pages left to read after taking the break.
#### 9
The answer is: 9
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If Joey has 30 pages to read for his history class tonight and he plans to take a break after completing 70% of the assigned pages, how many pages does he have left to read after taking the break?

### Answer:
