Samuel is eighth shortest in a class of 26 students. What will be his position if counted from the tallest in the class?

Which number replaces the question mark?

Pituitary: Brain :: Thymus : ? 

Deepak said to Nitin, " That boy playing football is the younger of the two brothers of the daughter of my father's wife. " How is the boy playing football related to Deepak? 

In each of the following questions, which one of the four interchanges in signs and numbers would make the given equation correct?
6x4+2=16 

If it was Friday on 3rd date of a month, then which day would come on the 4th day after 21st date of that month?

Seeta and Geeta started walking from a point A. Seeta walks 6 km towards North and then takes a right turn and walks 3 km . She then takes a right turn towards South and walks for 6 km. She again takes a left turn and walks 3 km, and reaches a point B. Geeta walks for 3 km towards West and takes a left turn and walks for 6 km; she takes a left turn and walks 9 km, and she reaches at a point C. How far is the point B from point C?

Rohit is 17th from left end of a row of 29 boys, Karan is 17th from the right end in the same row. How many boys are there between them in the row?