Verbal Reasoning - Mental Ability Questions

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
CEG, IKM, OQS, ?

Introducing a woman, a boy says, "She is the wife of my grandfather's son". How is the woman related to the boy?

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

XXXXXO, XXXXOX, XXXOXX, XXOXXX, XOXXXX, ?

Select the related word/letters/number from the given alternatives.
34 : 81 : : 23 : ?

What number should come in place of ?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?

9 + 3 - 72 x 6 ÷ 3 = ?

In these questions, the relationship between two elements is shown in the statements. These statements are followed by two conclusions.
Statement:
Z < L < W = N = K < A
Conclusion:
I. A > L
II. Z = A

Ryaan is Vehaan's mother's sister's father's only son's son. How is Ryaan related to Vehaan?