Verbal Reasoning - Mental Ability Questions

If "x" stands for addition, "<" stands for subtraction, "+" stands for division, ">" stands for multiplication, "–" stands for equals to, "÷" stands for greater than and "=" stands for less than, which of the following holds true?

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

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

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?

M_Q_C_M_Q_CM

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

RST, XYZ, DEF, ?

Select the related word/letters/number from the given alternatives.
841 : 29 :: 289 : ?

Find the missing number ?

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it? 

p_r_s_q_p_rs