Verbal Reasoning - Mental Ability Questions

In a certain code language, "TREASON" is written as "RKWWINX" and "POULTRY" is written as "CNXHYKT". How is "NUMBER" written in that code language?

The  following  questions  consist  of two  words  that  have  a  certain  relationship  to each   other,   followed   by   four   alternatives. Select  the  best  alternative  that  has  same relationship as the original pair of words

Crèche : Infants

If SYSTEM is written as RXRSDL.
How can CORRECT be written in that code?

If "+" means "minus", "x" means "divided by", "÷" means "plus" and "-" means "multiplied by", then
300 x 10 – 5 + 36 ÷ 57 = ?

If CROWNED is coded as APMULCB, then how will TAP be coded as?

If FLOTSAM is coded as UOLGHZN, then how will PIN be coded as?

In a certain code language, "DESIRE" is written as "EGVMWK". How is "RECESS" written in that code language?

The distance around a figure