Two-thirds of the class have brown eyes. Half of the students with brown eyes have black hair. If there are 6 students in the class with brown eyes and black hair, how many students are there in total?
There are 6 * 2 = <<6*2=12>>12 students with brown eyes and hair of any color.
There are 12 * 3/2 = <<12*3/2=18>>18 students in total.
#### 18