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 = ?

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

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

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

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

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

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

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