If 65 percent of a class answered the first question on a certain test correctly, 50 percent answered the second question on the test correctly, and 20 percent answered neither of the questions correctly, what percent answered both correctly?  Choose the correct option:
A) 25%
B) 30%
C) 35%
D) 40%
E) 45%
65% answered the first question correctly and 20% answered neither correctly.   Then 15% missed the first question but answered the second question correctly.   Then the percent who answered both correctly is 50% - 15% = 35%.   The answer is 35%.50  - 15= 
<gadget id="calculator">50  - 15</gadget>
<output>35</output>
35%.   The answer is 35%.
<result>C</result>
If 65 percent of a class answered the first question on a certain test correctly, 50 percent answered the second question on the test correctly, and 20 percent answered neither of the questions correctly, what percent answered both correctly?