In a class 40% of the students enrolled for Math and 70% enrolled for Economics. If 15% of the students enrolled for both Math and Economics, what % of the students of the class did not enroll for either of the two subjects?  Choose the correct choice from the following answers:
A) 5%
B) 15%
C) 0%
D) 25%
E) 20%
We know that (A U B) = A + B - (A n B), where (A U B) represents the set of people who have enrolled for at least one of the two subjects Math or Economics and (A n B) represents the set of people who have enrolled for both the subjects Math and Economics.   Note: (A U B) = A + B - (A n B) =&gt; (A U B) = 40 + 70 - 15= 
<gadget id="calculator">40 + 70 - 15</gadget>
<output>95</output>
95%   That is 95% of the students have enrolled for at least one of the two subjects Math or Economics.   Therefore, the balance  (100 - 95)= 
<gadget id="calculator"> (100 - 95)</gadget>
<output>5</output>
5% of the students have not enrolled for either of the two subjects.   5%NSWER:5%
<result>A</result>
In a class 40% of the students enrolled for Math and 70% enrolled for Economics. If 15% of the students enrolled for both Math and Economics, what % of the students of the class did not enroll for either of the two subjects?