Quantitative Aptitude - Arithmetic Ability Questions

The difference between simple and compound interests compounded annually on a certain sum of money for 2 years at 12% per annum is Rs 900. What is the value of given sum (in Rs)?

There is 40% increase in an amount in 5 years at simple interest. What will be the compound interest of Rs. 25000 after 3 years at the same rate?

The list price of an article is Rs. 900. It is available at two successive discounts of 20% and 10% . The selling price of the article is:

If x = a + 1a, y = a - 1a ,(a>0), then the value of x4+y4-2x2y2 is

If x2-3x+1=0, then x+1x is (x≠0)

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 x2 + ax + b, when divided by x + 3, leaves a remainder of -1 and x2 + bx + a, when divided by x - 3, leaves a remainder of 39, then a+ b = ?

A train starts moving from a place P at 10:00 a.m. and arrives at another place Q at 5:30 p.m. on the same day. If the speed of the train is 50 km/hr, then what will be the distance (in km) covered by the train?