Subject: mathqa
Question: if 85 percent of the test takers taking an old paper and pencil gmat exam answered the first question on a given math section correctly , and 75 percent of the test takers answered the second question correctly , and 15 percent of the test takers answered neither question correctly , what percent answered both correctly ?
Option: 
A: 65 %
B: 80 %
C: 70 %
D: 75 %
Answer: D