On the math section of the SAT logic questions do not appear often, but when they do they will ask for a reasonable conclusion that is based upon a set of facts that is presented. For example, if X then Y. This means it is an if/then that is seeking a logical conclusion or answer. 

 

EXAMPLE:

 

If the following statement is true: "If Tom lives in Alexandria, then Heather lives in Frankton," which of the following statements must also be true?

 

The best way to solve these types of questions is to substitute a state that is familiar. From here, it is just a matter of trying each combination until you find which one is also true - ie the correct answer. In logic questions "some" can mean one or more. This is another way test makers try to trick the test takers on the SAT math section.