Aptitude and Reasoning Questions

In each of the questions below are given three statements followed by three conclusions numbered I, II, and III. You have to take the given statements to be true even if they seem to be at variance with commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follow(s) from the given statements disregarding commonly known facts.
Statements:
Some tables are chairs.
All chairs are benches.
All benches are desks.
Conclusions:
I. Some desks are tables.
II. Some benches are tables.
III. Some desks are chairs.

The mean of a distribution is 18 and the standard deviation is 4.5. What is the value of the coefficient of variation?

Three balls ring at intervals of 15, 30 and 45minutes respectively. At what time will they ring together again, if they rang simultaneously at 8.00 AM?

What is the value of ( 1/2 - cot45) ?

In the question two statements are given, followed by two conclusions, I and II. You have to consider the statements to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements.

Statement I: No lighters are fire

Statement II: All matchboxes are lighters

Conclusion I: No fire are match boxes

Conclusion II: All matchboxes are fire

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

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

3, 6, 11, 20, ?

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

0.5, 2, 3.5, ? , 6.5