Verbal Reasoning - Mental Ability Questions

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

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 Quarantine : Isolation, then Freedom : ___

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

If 'A' stands for '+' , 'B' stands for '-' , 'C' stands for 'x' , what is the value of (10C4)A(4C4)B6 = ?

In the following question, select the related word from the given alternatives.
Pressure : Barometer : : ? : Odometer

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

56 ÷ 8 + 12 - 72 = ?

Deepak introduces Raju saying, "He is the husband of the granddaughter of the father of my father." How is Raju related to Deepak?