Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Miss Smith is teaching second period English and is shocked at how small the class seems. There are 6 tables in the classroom with 3 students currently sitting at each table. Sally said 3 girls went to the bathroom, and three times more students went to the canteen. Elliott said that 2 groups of students have recently been added to their class, and each group has 4 students in it. None of these students are in the class right now. Lucas pointed out that a few foreign exchange students have joined the class; 3 from Germany, 3 from France, and 3 from Norway. These students are also missing. How many students are supposed to be in the class?

### Response:
There are currently 3 * 6 = <<3*6=18>>18 students sitting in the classroom.
3 girls went to the bathroom, and 3 times more students went to the canteen, so 3 * 3 = <<3*3=9>>9 students went to the canteen.
Sally has therefore noticed the absence of 3 + 9 = <<3+9=12>>12 students.
Elliott said that 2 groups of students have joined the class, so there are another 2 * 4 = <<2*4=8>>8 students who are not in the classroom.
Lucas said that there are 3 + 3 + 3 = <<3+3+3=9>>9 foreign exchange students who are not in the classroom.
This means there are 12 + 8 + 9 = <<12+8+9=29>>29 students who are absent.
There are 18 students sitting in the classroom, so there should be 29 + 18 = 47 students.
#### 47