Verbal Reasoning - Mental Ability Questions

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

45 x 5 + 2 - 20 = ?

In certain code, if 'AMOUNT' is written as 'BNPTMS', how is 'AROUND' written in that code?

From the given words, select the word which can be formed using the letters of the given word.
AMPLIFICATION

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

FED , IHG , LKJ , ONM, ?

Which of the following diagram represents the relationship among Tall men, Black haired, Indians?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
25 + 10 ÷ 240 x 16 = ?

A series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series.
6, 18, 54, ? , 486, 1458

After interchanging + & x and 12 &18, which of the following equations will hold true?