Which rock is classified as a foliated metamorphic rock?

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

55 : 86 :: 39 : ?

34 is related to 155 by certain logic. Following the same logic, 49 is related to 168. To which of the following is 68 related, following the same logic?

Some equations are solved based on a certain system. On the same basis find out the correct answer for the unsolved equation.  

Fish : Aquarium ::  Birds : ? 

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

In the following question, select the related word from the given alternatives.

DARING: HWNEJK :: LODGES: ?

Select the related word/letters/number from the given alternatives.