Verbal Reasoning - Mental Ability Questions

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

x_zx_y_z_x_xyy_zzz

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

20 ÷ 2 - 3 + 10 x 6 = ?

A helicopter flies 80 km North, then it turns West and flies 50 km, then it turns North and flies 120 km, then it turns to its right and flies 50 km. Where is it now with reference to its starting position?

A contestant in a cycle race starts and cycles 3 km North, then turns East and cycles 5.5 km, then turns South and cycles 3 km, then turns to his left and cycles 7 km. Where is he now with respect to the starting position?

The weights of 4 boxes are 30, 20, 60 and 70 kilograms. Which of the following cannot be the total weight,in kilograms, of any combination of these boxes and in a combination a box can be used only once?

Mayank remembers that the examination is after 18th December but before 21st December, while Suraj remembers that the examination is before 24thDecember but after 19th December. On which date of December is the examination?

Consider the given statement/s to be true and decide which of the given conclusions/assumptions can definitely be drawn from the given statement.
Statements:
1. All cycles are ducks.
2. All ducks are swans.
Conclusions:
I. All swans are cycles.
II. Some swans are cycles.

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

6,11,21,36,56,?