Verbal Reasoning - Mental Ability Questions

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
XIIIII, IXIIII, IIXIII, IIIXII,IIIIXI, ?

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

8, 15, 28, 53, ?

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

ABC, ZYX, DEF, WVU, ?

Select the missing numbers from the given alternatives

In the following question, from the given alternative words, select the word which cannot be formed using the letters of the given word.
Representation

In a certain code language, 'x' represents '+', '÷' represents 'x', '-' represents '÷' and '+' represents '-'. Find out the answer to the following question.

25 ÷ 2 - 10 + 10 x 6 = ?

In a certain code, 'book is big' is written as 756; 'big is story' is 764 and 'story book is interesting' is 4356. Which digit represents 'interesting'?

Select the missing number from the given options.