Quantitative Aptitude - Arithmetic Ability Questions

If 1/√(cosec2A - 1) = x, then value of x is

If x = cosecθ - sinθ and y = secθ - cosθ, then the relation between x and y is

The average height of 50 bats is 126 cm. Some bats of average height 120 cm are removed. If the new average height is 130 cm, then how many bats are remaining?

Diameter of wheel of a cycle is 21 cm. The cyclist takes 45 minutes to reach a destination at a speed of 16.5 km/hr. How many revolutions will the wheel make during the journey?

If Mr. Raghav taught a total of 500 hours, then what is the difference in number of hours of teaching algebra and modern Maths?

If (1 - sinA)/(1 + sinA) = x, then x is

A balloon leaves from a point P rises at a uniform speed. After 6 minutes, an observer situated at a distance of 450√3 metres from point P observes that angle of elevation of the balloon is 60 deg. Assume that point of observation and point P are on the same level. What is the speed (in m/s) of the balloon?

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