Quantitative Aptitude - Arithmetic Ability Questions

Koushik can do a piece of work in X days and Krishnu can do the same work in Y days. If they work together, then they can do the work in

If 1 dupatta is offered free on purchase of 4 dupattas priced Rs 1300 each what is the effective discount on each dupatta?

The average weight of Sudesh, Jyothi and Ritu is 89 kg. If the average weight of Sudesh and Jyothi be 98 kg and that of Jyothi and Ritu be 83 kg, then the weight of Jyothi is

If a -­ b = 6 and ab =16, then a3 -­ b3 is

Simplify 437bxaz / 23ab.

What will be the value of r2+p2+s2-rp-ps-rs when r = 4, p = 2, s = 8?

A Village lost 12% of its goats in a flood and 5% of remainder died from diseases. If the number left now is 8360. What was the orignal number before the flood?

Consider two-digit numbers which remain the same when the digits interchange their positions. What is the average of such two-digit numbers?