Verbal Reasoning - Mental Ability Questions

In the following question, by using which mathematical operators will the expression become correct?
15 _ 3 _ 4 _ 20

In the question, a word is represented by only one set of numbers as given in any one of the alternatives. The sets of numbers given in the alternatives are represented by two classes of alphabets as in two matrices given below. The columns and rows of Matrix I are numbered from 0 to 4 and that of Matrix II are numbered from 5 to 9. A from these matrices can be represented first by its row and next by its column. e.g. N can be represented by 01, 14 etc. and A can be represented by 55, 69, etc. You have to identify the set for the word ‘GOOD’.

A word is represented by only one set of numbers as given in any one of the alternatives. The sets of numbers given in the alternatives are represented by two classes of alphabets as shown in the given two matrices. The columns and rows of Matrix-I are numbered from 0 to 4 and that of Matrix-II are numbered from 5 to 9. A letter from these matrices can be represented first by its row and next by its column, for example 'K' can be represented by 01, 34, etc... and 'P' can be represented by 65, 99, etc... Similarly, you have to identify the set for the word "BLAND".

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

BCF, CDG, DEH, ?

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

S, Q, N, J, ?

Four words have been given below of which three are alike in some way and one is different. Choose the odd one out.

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series. GJT, IMR, KPP, MSN, ?

Karan's number in the queue is twelfth from the counter. There are five people between Karan and Sunil. What is Sunil's number in the queue?