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?

45 x 5 - 24 + 3 ÷ 80 = ?

In this question, some equations are solved on the basis of a certain system. On the same basis find out the correct answer from amongst the four alternatives for the unsolved equation.

3X4X5 = 435
4X3X2 = 342
2X3X4= ?

Select the related letters from the given alternatives.
WUS : DFH :: MKI : ?

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

A is D's brother. D is B's father. B&C are sisters. How is C related to A?

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

200, 100, 50, 25, 12.5, 6.25, ?

In the following question, select the related letters from the given alternatives.
PRAG : QTDK : : STOP : ?

Select the missing letter from the given responses?