If Lisa has 14 pounds of clay and she uses 6 pounds for her project, that means she has 8 pounds left over. If she gives 1/5 pounds of clay to each student in the class, and has none left over, that means every five students given clay, 1 pound has been given. If there are 8 pounds left over and every 5 students equal 1 pound, multiply 5 and 8 together, and your answer is 40 students.