Quantitative Aptitude - Arithmetic Ability Questions

P alone can do a piece of work in 8 days and Q alone can do the same work in 10 days. In how many days will both together complete the same work?

A train is moving at the speed of 72 km/hr. How many seconds will it take to cover a distance of 1400 m ?

If the selling price is Rs 728 after getting a discount of 9%, what was the marked price?

PQR is a right angled triangle in which PQ = QR. If the hypotenuse of the triangle is 20 cm, then what is the area (in cm2) of the triangle PQR?

If a3+ b3 = 19 and a + b = 1, then what is the value of ab?

If the amount received at the end of 2nd and 3rd year at Compound Interest on a certain Principal is Rs 1,800, and Rs 1,926 respectively, what is the rate of interest?

If compound interest received on a certain amount in the 3rd year is Rs. 12,100, what will be the compound interest (in Rs) for the 4th year on the same amount if rate of interest is 9%?

An angle is (2/3)rd of its supplementary angle. What is the measure of the angle?