Quantitative Aptitude - Arithmetic Ability Questions

What is the simplified value of (cosec A + sin A)(cosec A – sin A)?

The internal bisectors of ∠Q and ∠R of triangle PQR meet at O. If ∠P = 70°, then what is the measure of ∠QOR (in degrees)?

Three angles of a quadrilateral are 60°,90°and 100°. Then the fourth angle of the quadrilateral is

The radius of a hemisphere is 21 cm, what is its volume? (Take π = 22/7)

Find the perimeter (in cm) of a semicircle of radius 14 cm.

A regular square pyramid has side of its base 20 cm and height 45 cm is melted and recast into regular triangular pyramids of equilateral base of side 10 cm and height 10√3 cm. What are the total numbers of regular triangular pyramid?

The average revenues of 13 consecutive years of a company is Rs 78 lakhs. If the average of first 7 years is Rs 73 lakhs and that of last 7 years is Rs 85 lakhs, what is the revenue for the 7th year?

What sum will produce the same interest in 9 years at the rate 8% simple interest as Rs. 800 producein 3 years at 9/2% per annum?