Verbal Reasoning - Mental Ability Questions

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

18 + 2 x 30 ÷ 6 - 4 = ?

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

16 x 4 ÷ 15 - 9 + 4 = ?

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

BCF, CDG, DEH, ?

Three positions of a cube are shown below. What will come opposite to face containing 'I'?

Select the missing numbers from the given responses.

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

WD, SH, OL, ?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
642 x 6 ÷ 25 + 4 = ?

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?

ab_ _abbc_aa_bbb