Tina has 12 pink pens.
She has 9 fewer green pens than pink pens, so she has 12 - 9 = 3 green pens.
She also has 3 more blue pens than green pens, so she has 3 + 3 = 6 blue pens.
The total number of pens she has is 12 + 3 + 6 = 21 pens.
#### 21
The answer is: 21
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If Tina has 12 pink pens and 9 fewer green pens than pink pens, and also has 3 more blue pens than green pens, what is the total number of pens that Tina has?

### Answer:
