The 7th grade French and Spanish classes each have 12 students in them, and there are two students in the 7th grade taking both languages. If everyone in the 7th grade is in at least one of the two language classes, how many students are taking just one of the two classes?  Choose the correct choice:
A) 19 B) 20 C) 21 D) 22 E) 23
French class + Spanish class = 24 students.   Two students are in both classes so they were counted twice.   The number of students taking just one class is 24 - 2(2) = 20.   The answer is 20.
<result>B</result>
The 7th grade French and Spanish classes each have 12 students in them, and there are two students in the 7th grade taking both languages. If everyone in the 7th grade is in at least one of the two language classes, how many students are taking just one of the two classes?