What comes next: A, C, F, J, O, ?

Which number replaces the question mark: 1, 4, 9, 16, 25, ?

Statements: Some politicians are actors. Some actors are directors. No director is a writer. Some writers are singers. Conclusion I: Some politicians are writers. Conclusion II: Some actors are singers. Which is valid?

Which number replaces the question mark: 2, 5, 11, 23, 47, ?

A man walks 3 km North, turns right and walks 2 km, turns right and walks 3 km, turns right and walks 2 km. Where is he relative to starting point?

In a certain code language, if MONDAY is written as 48, then FRIDAY is written as: