If 75 percent of a girls answered the first question on a certain test correctly, 55 percent answered the second question on the test correctly, and 20 percent answered neither of the questions correctly, what percent answered both correctly?	Select:  A) 10%  B) (8) 20%  C) 30%  D) 40%  E) 50%
{Total} = {First} + {Second} - {Both} + {Neither}   100% = 75% + 55% - {Both} + 20% --&gt; {Both} = 50%.   Answer: 50%.
<result>E</result>
If 75 percent of a girls answered the first question on a certain test correctly, 55 percent answered the second question on the test correctly, and 20 percent answered neither of the questions correctly, what percent answered both correctly?