Verbal Reasoning - Mental Ability Questions

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

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

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
A, E, J, N, S, W, ?

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

9 - 18 + 35 x 10 ÷ 30 = ?

If 11$25 = 18, 12$20 = 16 then what is the value of 4$50 = ?

Identify the diagram that best represents the relationship among classes given below
Tennis fans, Cricket players, Students

Introducing a man, a woman says, "He is the son-in-law of the wife of my father and I am the only child of my parents". How is the man related to the woman?

If MARBLES is coded as PDUEOHV, then how will GIN be coded as?