Quantitative Aptitude - Arithmetic Ability Questions

A sum of Rs 10000 becomes Rs 14641 when invested at compound interest at the yearly interest rate of 20% per annum. If the compounding is done half yearly, then for how many years was the sum invested?

What is the compound interest on Rs. 48,000 for 2 years at 20% p.a., if interest is compounded annually?

In the following question, select the odd letter/letters from the given alternatives.

Factorise x2 + 3x -­ 18

From a point on a bridge across the river, the angles of depression of the banks on opposite sides of the river are 30° and 45° respectively. If the bridge is at a height of 2.5m from the banks, then the width of the river is (take √3 = 1.732)

Two fractions are such that their product is ­4 and sum is ­32/15. Find the two fractions.

If x + [1/(x + 7)] = 0, then what is the value of x – [1/(x + 7)]?

The radii of two concentric circles are 68 cm and 22 cm. The area of the closed figure bounded by the boundaries of the circles is