There are four boxes labeled A, B, C, and D. Box A contains apples, Box B contains bananas, Box C contains cherries, and Box D is empty. If Box A is heavier than Box B and Box C is lighter than Box A, which box is the lightest?
A committee of four members is to be formed from the following individuals: P, Q, R, S, and T. The selection criteria are: 1) P and Q cannot be selected together. 2) R must be included if S is included. 3) T can be included only if P is not included. Which of the following combinations is valid?
A selection of three fruits is to be made from the following: Apple, Banana, Cherry, Date, and Elderberry. The conditions are: 1) Apple and Banana cannot be selected together. 2) Cherry must be included if Date is included. 3) Elderberry can be included only if Banana is not included. Which of the following selections is valid?
A class consists of students: John, Sarah, Mike, and Lisa. John is older than Sarah but younger than Mike. Lisa is younger than Sarah. Who is the youngest student in the class?