Who has been roped in as the ambassador of the Russian

In each of the following questions select the related letter/word/figure/number from the given alternatives.

25 : 175 : : ? : 160

Select the option that is related to the third number in the same way as the second number is related to the first number.

53: 636 :: 51: ?

Select the word-pair in which the two words are related in the same way as the two words in the following word-pair.

Author : Book

Four numbers have been given, out of which three are alike in some manner and one is different. Select the number that is different.

Which set of letters when sequentially placed at the gaps of the given letter series shall complete it?

C L _ I M C _ A I M C L _ _ M CL _ I M

Select the number pair which is related in the same way as the two numbers of the following pair:

64 : 25

Select the option that is related to the third number in the same way as the second number is related to the first number.

13 : 2366 :: 9 : ?