In an examination 30% failed in Math and 70% failed in French. If 20% failed in both. What % of students passed in both. Pick one:
A) 25% B) 15% C) 20% D) 30% E) 10%
Passed in Math = 100 - 30= 
<gadget id="calculator">100 - 30</gadget>
<output>70</output>
70%   Passed in French= 100 - 70= 
<gadget id="calculator">100 - 70</gadget>
<output>30</output>
30%   Students who passed Math or French= 100 -20= 
<gadget id="calculator">100 -20</gadget>
<output>80</output>
80%   Students passed in Math and French= (Passed in Math) + (Passed in French) - (Students who passed Math or French) = 70+30-80= 
<gadget id="calculator">70+30-80</gadget>
<output>20</output>
20%   ANSWER:20%
<result>C</result>
In an examination 30% failed in Math and 70% failed in French. If 20% failed in both. What % of students passed in both.