If exactly 7 guests drank only one of the two types of drinks, how many guests drank both types of drinks?
Choose the correct choice from the following answers.
A) 5 B) 6 C) 7 D) 4 E) 2
Say x guests drank both drinks.   (7 - x) + (4 - x) = 7 --&gt; x = 2.   Answer: 2.
<result>E</result>
If exactly 7 guests drank only one of the two types of drinks, how many guests drank both types of drinks?