Verbal Reasoning - Mental Ability Questions

If "#" means "subtraction", "&" means "division", "@" means "addition" and "%" means "multiplication", then 315&3#9@4%6 = ?

In a certain code language, “FRONT” is written as “618151420” and “BORNE” is written as “21518145”. How is “MORNS” written in that code language?

A series is given, with one word missing. Choose the correct alternative from the given ones that will complete the series.

bat, thin, reply, length, ?

In the following question, select the related letters from the given alternatives.
PRAG : QTDK : : STOP : ?

Select the related number from the given alternatives.
12.5 : 6.25 :: 7 : ?

Five boys are sitting facing towards South. Raj is between Rohit and Vishal. Vishal is to the immediate right of Manoj and Manoj is to the immediate right of Shekhar. Who is sitting in the middle?

In the following question, select the related word pair from the given alternatives.
Canada : Ottawa : : ? : ?

Pointing at X, Y says, "X is the son of the only son of my mother". Then Y is X's ___.