Verbal Reasoning - Mental Ability Questions

In the following question, by using which mathematical operators will the expression become correct?
30 ? 6 ? 4 ? 5 ? 4

A man travels 10 km towards west, then he takes a turn towards north-­east and travels 20 km in the direction. He again takes a turn towards south-­east and covers 5 km. Taking starting point as the origin, in which direction is he now?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series. AB, GH, MN, ST, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
RS, ZA, HI, ?

From the given alternative words, select the word which cannot be formed using the letters of the given word. SPECULATION

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series. TP, UQ, WS, ZV, ?

There are 45 trees in a row. The lemon tree is 20th from right end. What is the rank of lemon tree from left end?

If 'how are you' is written as 'ne ki se' and 'where are you' as 'ne bl se' and 'you were here' as 'ke ne jo', then 'how you here' is written as