Verbal Reasoning - Mental Ability Questions

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

9 ÷ 12 - 15 + 4 x 10 = ?

The following equation is incorrect. Which two signs should be interchanged to correct the equation? 12 - 6 x 5 + 20 ÷ 4 = 31

In the following question, select the missing number from the given series.
5, 13, 40, 104, ?

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
efg _ _ eff _ ghhe _ eff _ gggh _ h

If FLOTSAM is coded as UOLGHZN, then how will PIN be coded as?

If 6@1 = 12, 6@2 = 24 and 9@9 = 162, then find the value of 4@6 = ?

Which one of the following diagrams represent the correct relationship between DOCTORS, SURGEONS and NURSES