Verbal Reasoning - Mental Ability Questions

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?

Rearrange the jumbled letters to make meaningful words and then select the one which is different.

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

5, 11, 24, 51, ?

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 the following question, select the related number from the given alternatives.
48 : 63 : : 80 : ?

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 = ?

In a row of swimmers Manish, is 23rd from the left end. Ramesh is 11 ranks to the left of Manish. If Ramesh is 16th from right end, then how many swimmers are there in this row?

While posing for a family photo, the father is standing to the right of the son and left of the grandmother. The mother is sitting to the left of her daughter and right of the grandmother. Who is seated in the middle?