Verbal Reasoning - Mental Ability Questions

If "A" denotes "multiplied by", "B" denotes "subtracted from", "C" denotes "added to" and "D" denotes "divided by", then

8 B 31 C 49 D 7 A 16 = ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
VWX, BCD, HIJ, ?

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?

P_P_RPQ_S_Q_ST

In the following question, select the related letters from the given alternatives.
JQXE : LSZG : : MTNL : ?

In the following question, select the related number from the given alternatives.
4 : 17 : : 7 : ?

Pointing towards a girl, Rajan said, she is the daughter of my mother's daughter. Then how is the girl related to Rajan?

Choose the related word/letters/number from the given alternatives. 19 : 6859 : : 21 : ?

M is son of P, Q is the grand-daughter of O, who is the husband of P. How is M related to O?