Quantitative Aptitude - Arithmetic Ability Questions

If (1 -­ cosA)/(1 + cosA) = x, then the value of x is

The compound interest earned in two years at 12% per annum is Rs 10176. What is the sum (in Rs) invested?

The angles of depression of two ships from the top of a light house are 45° and 30° toward east. If the ships are 200m apart, the height of the light house is (take √3=1.73)

A and B together can do a piece of work in 36 days, B and C together can do it in 24 days. A and C together can do it in 18 days. The three working together can finish the work in

What is that least number that must be added to the product 684 × 686 to make it a perfect square?

The sum of all prime numbers between 18 and 32 is:

If 4r = h + r2+h2 then r: h = ? (r not equal to 0)

Two circles are having radii 9 cm and 12 cm. The distance between their centres is 15 cm. What is the length (in cm) of their common chord?