The sum of ages of A, B and C is 81 years. One year before t

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The sum of ages of A, B and C is 81 years. One year before the ratio of ages of A and B was 1 : 2 and that of B and C was 4 : 7, so find the age of B after 6 years.

[IBPS PO mains 2017]

A 24 years

B 25 years

C 42 years

D 31 years

E 29 years