Verbal Reasoning - Mental Ability Questions

In a certain code language, "OCEAN" is written as "PEHES". How is "RIVER" written in that code language?

In a certain code language, "DELETE" is written as "#@^@%@" and "GRAM" is written as "!?*&". How is"TELEGRAM" written in that code language?

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

If "-" means "plus", "x" means "divide", "÷" means "multiply" and "+" means "minus", then 26 + 400 x 20 – 21 ÷ 12 = ?

If IMPLORE is coded as GKNJMPC, then how will HUB be coded as?

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
_ yzaa _ y _ xy _ aazy _

If "A" denotes "added to", "B" denotes "divided by", "C" denotes "multiplied by" and "D" denotes "subtracted from", then 154 B 11 C 6 A 6 D 27= ?

If S = 19, SUN = 54 and CAKE = 20 , then MISTAKE = ?