6 : 35 : : 7 : ? 

7 : 30 :: 17 : ?

Select the number pair in which the two numbers are related in the same way as the two numbers of the pair given below.

35:6

In the following question, select the related number from the given alternatives.
50: 65 :: 122 :?

In each of the following questions select the one which is different from other three responses.

225 : 400 :: 625 : ?

Select the option that is related to the fifth number in the same way as the second number is related to the first number and fourth number is related to third number.
121 : 145 :: 49 : 65 :: 169 :?

6 : 12 : : 20 : ?