Verbal Reasoning - Mental Ability Questions

Find the odd word/letters/number pair from the given alternatives.

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
24 x 6 - 8 + 2 = ?

The distance between two cities is 30 Km. A man goes at a speed of 30 Km per hour and returns at 20 Km per hour. What is his average speed?

Sonal is standing to the north of Amar and to the west of Mahi. In which direction is Mahi standing with respect to Amar?

If (2)#* 4 = 2 and (4)#* 4 = 16, then what is the value of A in (6)#* A = 18?

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

8 ÷ 6 - 5 + 70 x 10 = ?

A series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series.
-7.25, -5.75, -4.25, -2.75, ? , 0.25

Out of the 100 nature lovers, 20 people wanted to see only bison, 30 wanted to see both bison and tiger, 15 wanted to see only leopard, 25 wanted to see only tiger, 5 wanted to see both bison and leopard and the remaining wanted to see only bear.

The ratio of people to wanted to see tiger to those who wanted to see bear is