Find the missing number?

If 18 ( 9 ) 3 and 36 ( 30 ) 5 , then what is the value of A in 19 ( A ) 18 .

Choose the number missing in the third cross:

Which number replaces the question mark?

In the following question, select the number which can be placed at the sign of question mark(?) from the given alternatives.

In the following question, select the number which can be placed at the sign of question mark (?) from the given alternatives.

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
COT, DQU, ESV, FUW, ?

In the following question, select the missing number from the given series.