Verbal Reasoning - Mental Ability Questions

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

9 + 3 - 72 x 6 ÷ 3 = ?

Spandana is the sister of Raju. How is Raju's father's sister related to Spandana?

In the following series, one letter is missing as shown by the ?. Select the missing letter from the given options.

Q, N, K, H, ?

Choose the odd one from the following:

In a certain code language, "BISLERI" is written as "IREBISL". How is "PANTHER" written in that code language?

In the following question, select the related word from the given alternatives.
Goiter : Iodine : : Anemia : ?

Pointing towards a boy, a girl says, "He is the only son of my mother's brother". How is the girl related to the boy ?

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

OXXXXX, XXXXO, OXXX, XXO, OX, ?