Verbal Reasoning - Mental Ability Questions

Select the related word/letters/number from the given alternatives.
66 : 36 : : 99 : ?

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

FED , IHG , LKJ , ONM, ?

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

RS, WX, ? , GH

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
a _ bc _ a _ bcdabc _ da _ cd _

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

Arrange the given words in the sequence in which they occur in the dictionary.
i. Victory
ii. Victorious
iii. Vaccine
iv. Vacancy

If 'HARBOUR' is written as 'IBSCPVS' , how is 'HABITAT' written in that code?

If 'x' means '-', '-' means 'x', '+' means '/' and '/' means '+', then what is the value of 15 - 2 / 900 + 90 x 100?