Ruth is older than Sam. Sam is older than Tom. Tom is older than Uma. Which statement must be true?
Answer and explanation
Correct answer: D. Ruth is older than Uma.
- Step 1: The chain from oldest is Ruth, Sam, Tom, Uma. Step 2. Ruth is therefore older than Uma. Answer: Ruth is older than Uma. Why not the others: Uma is older than Sam.: This contradicts Sam being older than Tom, who is older than Uma. Tom is the oldest.: This contradicts Ruth and Sam both being older than Tom. Sam is younger than Uma.: This contradicts the chain, because Sam is older than Tom and Tom is older than Uma.
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