Verbal Reasoning - Mental Ability Questions

In a certain code language, 'x' represents '+', '÷' represents 'x', '-' represents '÷' and '+' represents '-'. Find out the answer to the following question.

17 x 18 ÷ 30 - 20 + 14 = ?

Introducing a girl, Raju says, "She is the daughter of my grandfather's son's daughter". How is the girl related to Raju?

Find the odd word/letters/number pair from the given alternatives.

In a certain code language, “FAINT” is written as “DYGLR”. How is “METRO” written in that code language?

In a certain code language, "RUMOUR" is written as "MURRUO". How is "RACKET" written in that code language?

In the following question, select the related number from the given alternatives.
243 : 578 : : 163 : ?

Identify the diagram that best represents the relationship among the given classes.
Brain, Cerebrum, Liver, Human body

In the following question, by using which mathematical operators will the expression become correct?
30 ? 6 ? 4 ? 5 ? 4