Find the odd word from the following:

Given set
12, 20, 28 

What will come in place of question mark(?) in the following number series?

BDE, CFG, EJK,  ?

Direction: What should come in place of the questions mark (?) in the following letter series?
reoc, pgme, nikg, Ikii, ? 

Four pairs of words are given below out of which three are alike in some manner and one pair is different. Which is different from the rest? 

Find the missing number.

Pointing to a girl in a photograph, Sunita said, "She is the mother of Renu, whose father is my son". How is she(Sunita) related to that girl?

When Rahul was born, his father was 32 years older than his brother and his mother was 25 years older than his sister. If Rahul's brother is 6 years older than him and his mother is 3 years younger than his father, how old was Rahul's sister when he was born ?