Eight persons D,M,P,B,R,S,T,N related to each other, born in 1952,1956,1981,1984,1987,2014,2017 (ages as of 2023=71,67,42,39,36,9,6). N is nephew of M's spouse. Diff N and N's mother = multiple of 10. M's uncle's age is prime but not oldest. Diff D and D's son = prime <20. Diff B and B's mother-in-law = multiple of 5. Various other constraints. What is M's uncle's age?

36 years
42 years
39 years
67 years

Correct answer: 67 years

Solution

Ages in 2023: 71(1952),67(1956),42(1981),39(1984),36(1987),9(2014),6(2017). Prime ages: 67 and 71. M's uncle is prime-aged but not the oldest person → not 71 → uncle=67 years.

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