Chart Question and Percentages

Question

The Venn Diagram above represents the 20 students who took one or more of the 3 available art class or took no art class at all. What percent of the students took only 1 art class?

A. 10%

B. 20%

C. 30%

D. 40%

E. 50%

Answer 1

Students which take only one class are placed into the non-intersecting parts of the diagram:

Adding these: $3+3+4=10$

$10/20=\%50$ takes only one class.