Verbal Reasoning - Mental Ability Questions

If MARBLES is coded as PDUEOHV, then how will GIN be coded as?

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

Rampal told Arjun, "Yesterday I defeated the only brother of the daughter of my grandmother." Whom did Rampal defeat?

Amit and Ritu are a couple. Mrinal and Shonal are brothers. Mrinal is the brother of Ritu. How is shonal related to Amit?

If the second half of the given series is reversed, then what will be the fifth term to the left of the ninth term from the right?

9$YX8N6OLBUJZT@1QFD%

Select the related number from the given alternatives.
7.25 : 7.75 :: 9 : ?

I go 5 km East, then turn right and go 8km. Then I turn left and go 5 km and then I turn left and go 8 km. At what distance am I from the starting point?

If 11$25 = 18, 12$20 = 16 then what is the value of 4$50 = ?