Quantitative Aptitude - Arithmetic Ability Questions

What is the value of cosecA/√(cosec2A ­- 1)?

In the following question, select the odd word pair from the given alternatives.

If cos 21° = x/y, then cosec 21° -­ cos 69° is equal to

What are the roots of the quadratic equation: x2 + 3x ­- 154 = 0

20% of a = b, then b% of 20 is the same as _________ of a.

A 1.6 m tall observer is 45 meters away from a tower. The angle of elevation from his eye to the top of the tower is 30°, then the height of the tower in meters is

The smallest number, which should be added to 756896 so as to obtain a multiple of 11, is

The ratio between the speeds of two buses is 11:9. If the second bus runs 270 kms in 15 hours, then the speed of the first bus is?