Verbal Reasoning - Mental Ability Questions

Which set of letters when sequentially placed at the gaps in the given letter series shall complete it?

s_r_t_s_r

If 27 (15) 33 and 41 (13) 53, then what is the value of 'A' in 26 (A) 35?

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

Identify the diagram that best represents the relationship among the given classes.
Brain, Cerebrum, Liver, Human body

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

17 x 18 ÷ 30 - 20 + 14 = ?

In a certain code language, “FAINT” is written as “DYGLR”. How is “METRO” written in that code language?

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

What will come in place of the question mark (?) in the following number series?11, 19, 40, 87, 173, ?