### Instruction: You have three shirts and four pairs of pants.  How many outfits consisting of one shirt and one pair of pants can you make?### Response: This problem is about counting the number of possible combinations of shirts and pants.
One way to approach this is to use the multiplication principle: if there are n choices for one thing and m choices for another thing, then there are n times m choices for both things together.
In this case, there are three choices for a shirt and four choices for a pair of pants, so the number of outfits is 3 times 4, which is 12.