Tricky question help me to solve it........

[pzazz12]

In a class of 40 students, 12 enrolled for both English and German. 22 enrolled for German. If the students of the class enrolled for at least one of the two subjects, then how many students enrolled for only English and not German?

A. 30
B. 10
C. 18
D. 28
E. 32

[sumit.sinha]

In a class of 40 students, 12 enrolled for both English and German. 22 enrolled for German. If the students of the class enrolled for at least one of the two subjects, then how many students enrolled for only English and not German?

A. 30
B. 10
C. 18
D. 28
E. 32

Using double-axis matrix, answer = C

[Rahul@gurome]

Answer choices are not in correct GMAT order.
Let E = students who enrolled for English
G = students who enrolled for German
Students who enrolled for both E and G = 12
So, 40 = E + 22 - 12
E = 30, which also includes the students who enrolled for German also.

Therefore, students who enrolled for only English and not German = 30 - 12 = 18

[spoiler]The correct answer is (C).[/spoiler]

[Yanat]

Using the Simple Venn Diagram concepts

40 = x+12+10 and so x = 18