Which one of the following is used as biofertilizer in

Find the missing term.

In each of the following questions, select the related number from the given alternatives:

8/15 : 2/5 : : 16/21 : ?

Find the missing letter.

UDGO : FWTL : : MXRC : ?

Study the given pattern carefully and select the number that can replace the question mark [?] in it?

2, 5, 11, 23, ?

Study the given pattern carefully and select the number that can replace the question mark (?) in it.

E/M ∶ 20/156: : G/O: ?

Select the number that can replace the question mark (?) in the following series. 

Find the next term / numbers in the given series?

54, 46, 40, 36, ?