In a class of 40 student, a student can study french or Geography , if 20 study french,23 study Geography and 7 study neither
A. Represent the information on a Venn diagram
B. How many students study both subject
Sketch two intersecting circles, label them F and G
Enter x in the intersection of both circles, enter 7 outside the circles
in the French-only part enter 20-x, in the Geography-only enter 23-x
20-x + x + 23-x + 7 = 40
-x = -10
x = 10
so 10 study both subjects