A is the sister of B. B is the brother of C, C is the son of D. How is D related to A?

DIRECTIONS: What Comes in place of question mark (s) in the following letter series?
AYBZC, DWEXF, GUHVI, JSKTL,?

In a family, each daughter has the same number of brothers as she has sisters and each son has twice as many sister as he has brothers. How many sons are there in the family?

Ramesh started from his house at 7:00 p.m. for his cycling practice. He went 8 km towards East, took left turn for 6 km, and again a left turn for 8 km. Then he decided to turn South-east till he reached the point where he had taken the first left turn. From there he took a right turns till he reached his house at 09:30 p.m. What distance did Ramesh cover on the South-east track?

In the following question, select the odd letters from the given alternatives.

Which word will appear third when arranged in order of dictionary?
1. Crumble 2. Cream 3. Crime 4. Crimp 5. Crown

Select the letter that can replace the question0a mark (?) in the following series.
K, B, N, D, Q, F, T, H,?

In a certain code language. 'BEAUTY' is written as 'ZUVBFC'. He will 'MARTYR' be written as in that language?