If 75 percent of a class answered the first question on a certain test correctly, 70 percent answered the second question on the test correctly, and 20 percent answered neither of the questions correctly, what percent answered both correctly?  Choices:
A) 10 %	B) ( 8 ) 20 %	C) 30 %	D) 50 %	E) 65 %

Rationale: { total } = { first } + { second } - { both } + { neither } 100 % = 75 % + 70 % - { both } + 20 % - - > { both } = 65 % . answer : e .
Answer: E