Quantitative Aptitude - Arithmetic Ability Questions

Marked price of an article is Rs 520 and selling price is Rs 384.8. What is the discount percentage?

If x + (1/x) = 2, then what is the value of x21 + (1/x1331)?

In a mixture, unbroken and broken rice grains are in the ratio 3 : 2. How much fraction of the mixture must be drawn off and substituted with broken grains, so that the ratio of unbroken and broken grains becomes 1 : 1?

A thief is stopped by a policeman from a distance of 400 metres. When the policeman starts the chase, the thief also starts running. Assuming the speed of the thief as 5 km/h and that of policeman as 9 km/h, how far the thief would have run, before he is over -taken by the policeman?

20 boys do one fourth of work in 25 days. How many more boys will be required to complete the remaining work in 50 days?

Find the odd one out among the following.

Area of circle is equal to the area of a rectangle having perimeter of 50 cms. and length more than the breadth by 3 cms. What is the diameter of the circle?

The circumference of a circle is equal to the perimeter of an equilateral triangle. If the radius of the circle is 7 cm what is the length of the side of the equilateral triangle?