1. The problem statement, all variables and given/known data One of four girls has emptied a cookie jar. Their statements are as follow: ALICE: "Betsy did it." BETSY: "Martha did it." BARBARA: "I didn't do it." MARTHA: "Betsy lied when she said I did it." If only one statement is true, which of the girls took the cookies? 2. Relevant equations Logic. 3. The attempt at a solution Anyone know the answer?