If 75 percent of a class answered the first question on a certain test correctly, 25 percent answered the second question on the test correctly, and 20 percent answered neither of the questions correctly, what percent answered both correctly?  Choose one:
A) 10%
B) 20%
C) 30%
D) 50%
E) 65%
{Total} = {First} + {Second} - {Both} + {Neither}   100% = 75% + 25% - {Both} + 20% --&gt; {Both} = 20%.   Answer: 20%.
<result>B</result>
If 75 percent of a class answered the first question on a certain test correctly, 25 percent answered the second question on the test correctly, and 20 percent answered neither of the questions correctly, what percent answered both correctly?