In a family of six members: P, Q, R, S, T, and U, P is the father of Q, Q is the mother of R, S is the sister of T, and U is the brother of R. Who is the grandmother of R?
In a class of students: X, Y, Z, W, and V, X is smarter than Y but not as smart as Z. W is smarter than V but not as smart as X. Who is the least smart?
In a class, there are three types of students: athletes, musicians, and artists. If John is an athlete, Sarah is a musician, and Mike is both an athlete and an artist, which of the following is a correct classification?