Let \( t \) be the number of bags of clementines that Trisha brought.
Each bag contains 12 clementines. Therefore, the total number of clementines brought by each person can be expressed as follows:
- Sal brought \( 4 \) bags, which means he brought \( 4 \times 12 = 48 \) clementines.
- Joe brought \( 6 \) bags, which means he brought \( 6 \times 12 = 72 \) clementines.
- Trisha brought \( t \) bags, so she brought \( t \times 12 \) clementines.
We know that the total number of clementines brought by all three is 180. We can write the equation as:
\[ 48 + 72 + 12t = 180 \]
This is the equation you can use to determine how many bags Trisha brought.