What comes in place of question mark (?) in the series given below?
W-144, ?, S-100, Q-81, O-64

Which one of the following figures represents the statement:

All the persons know English.
 Few of them know Hindi also.
 Those who know Hindi know Bengali.

Given set
10, 12, 15

How many such pairs of letters are there in the word ‘EVAPORATE’ each of which has as many letters between them in the word as they have between them in the English alphabet?

Find the odd word from the following:

Find the missing number.

17 : 60 : : 20 : ?

Select the missing number from the given responses.