Question: 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? Think carefully first, then make a decision:
Tina has 12 - 9 = 3 green pens. Tina has 3 + 3 = 6 blue pens. In total Tina has 12 + 3 + 6 = 21 pens. So the answer is 21.