Then find how many students in Ms. Perez's class collected 12 cans each: 30 students / 2 = <<30/2=15>>15 students
Then find how many cans the students who collected 12 cans each collected in total: 15 students * 12 cans/student = <<12*15=180>>180 cans
Then find how many cans the students who collected 4 cans each collected in total: 13 students * 4 cans/student = <<4*13=52>>52 cans
Then add both amounts of cans to find the total: 180 cans + 52 cans = <<180+52=232>>232 cans
#### 232