Discussion
There are six persons, P, Q, R, S, T and U. T is older than P and R. U is younger than Q. T is younger than S. R is older than Q but younger than P. Who is the second youngest of all?
Answer: B
Q is the second youngest. From the statements: T is older than P and R, and T is younger than S, so S > T > P and S > T > R. R is older than Q but younger than P, so P > R > Q. U is younger than Q. Combining, the order from oldest to youngest is S, T, P, R, Q, U. The youngest is U, so the second youngest is Q. P and R are older than Q, and U is the youngest, not the second youngest, so the options P, R and U are wrong. Listing the order oldest to youngest as S, T, P, R, Q, U and counting up from the youngest end gives U first and Q second.
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