Tina has 12 pink pens. She has 9 fewer green pens than pink pens. Tina has 3 more blue pens than green pens. How many pens does Tina have in total?
Tina has 12 - 9 = <<12-9=3>>3 green pens.
Tina has 3 + 3 = <<3+3=6>>6 blue pens.
In total Tina has 12 + 3 + 6 = <<12+3+6=21>>21 pens
#### 21