Verbal Reasoning - Mental Ability Questions

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

5 ÷ 4 ­ 10 + 7 x 16 = ?

In a certain code language, “MUTE” is written as “60” and “TYRE” is written as “69”. How is “HYPE” written in that code language?

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

Select the related word/letters/numbers from the given alternatives: DBCE : QOPR :: JLKI : ?

P is the brother of Q. Q is the brother of R. P is the son of S. Based these three statements, much of the following statements cannot be definitely true?

In the following question, from the given alternative words, select the word which cannot be formed using the letters of the given word.
Biological

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series. 100, 50, 52, 26, 28, ? , 16, 8