Verbal Reasoning - Mental Ability Questions

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

If "÷" denotes "multiplied by", "+" denotes "subtracted from", "–" denotes "added to" and "x" denotes "divided by", then which of the following equation is true?

Which number will complete the series?
1,8,27,64,125,216,________

If A denotes −, C denotes ×, D denotes ÷, E denotes +, then 14C3A12E4D2=?

Deepu started his journey from A and moves 2 km towards South, then he turns right and moves 1⁄2 kilometre. Again he takes a right turn and walks 2km. Now he takes a left turn and walks 3 km more. How far he is from the starting point?

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

If "S" denotes "multiplied by", "V" denotes "subtracted from", "M" denotes "added to" and "L" denotes "divided by", then

12 V 3 M 441 L 21 S 8 = ?

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