Quantitative Aptitude - Arithmetic Ability Questions

The compound interest earned in two years at 15% per annum is Rs 20640. What is the sum invested (in Rs)?

Reflection of the point (2,­7) in the y­axis is

A helicopter, at an altitude of 1500 m, finds that two ships are sailing towards it, in the same direction. The angles of depression of the ships as observed from the helicopter are 60° and 30°respectively. Distance between the two ships, in metres is

What is the value of Tan 45° - 1/√3 Sec 60°?

In a bag the ratio of red balls to green balls is 4 : 9. If 6 more green balls were added to the bag, the ratio of red balls to green balls would become 1 : 3. How many red balls are there in the bag?

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

If cosAcotA/(1 -­ sinA) = x, then the value of x is

The price of an article is discounted by 25%, to restore to its original value, the new price must be increased by