A shopkeeper lists the price of an article as Rs. 500. But he gives a certain discount which allows the buyer to pay Rs. 500 for the article including 10% sales tax. The rate of discount is

Pipe A can fill a cistern in 6 hours and pipe B can fill it in 8 hours. Both the pipes are opened simultaneously, but after two hours, pipe A is closed. How many hours will B take to fill the remaining part of the cistern?

A builder borrows Rs. 2550 to be paid back with compound interest at the rate of 4% per annum by the end of 2 years in two equal yearly instalments. How much will each instalment be?

A cuboidal water tank has 216 litres of water. Its depth is 1/3 of its length and breadth is 1/2 of 1/3 of the difference of length and breadth. The length of the tank is

The acid and water in two vessels A and B are in the ratio 4: 3 and 2: 3. In what ratio should the liquids in both the vessels be mixed to obtain a new mixture in vessel C containing half acid and half water?

The average age of a husband and a wife was 27 years when they married 4 years ago. The average age of the husband, the wife and a new-born child is 21 years now. The present age of the child is

The ratio of the number of boys and girls in a college is 3: 2. If 20% of boys and 25% of girls are adults, the percentage of those students who are the not adults, is

Speed of a boat is 5 km per hour in still water and the speed of the stream is 3 km per hour. If the boat take 3 hours to go to a place and come back, the distance of the place is:

In 30 litres mixture of acid, the ratio of acid and water is 2: 3. What amount of water should be added to the mixture so that the ratio of acid and water becomes 2: 5?

One flies a kite with a thread 150 metre long. If the thread of the kite makes an angle of 60 with the horizontal line, then the height of the kite from the ground (assuming the thread to be in a straight line) is