Verbal Reasoning - Mental Ability Questions

Which set of letters when sequentially placed at the gaps in the given letter series shall complete it?

_r_r_t_r_r_t

Pointing to a lady, Anju says, "She is the sister of my brother's mother". How is the lady related to Anju?

Choose the related word/letters/number from the given alternatives.
36 : 6 : : 441 : ?

Anand is son of Prema. Rajeev is brother of Prema. Neha is daughter of Rashmi . Neha is sister of Rajeev. How is Anand related to Rashmi ?

In the following question, select the related word from the given alternatives.
Kilometre : Metre : : Tonne : ?

If 18α1 = 34, 19α2 = 34 and 18α3 = 30, then find the value of 18α8 = ?

Select the related letters from the given alternatives.
DFI : ACF :: OQT : ?

 In a certain code language, “PRANK” is written as “RUESQ”. How is “RATES” written in that code language?