The value of cos1°. cos2°.cos3°..........cos179° is 

A pump can fill a tank with water in 1 hour. Because of a leak, it took \(1{1\over3}\) hours to fill the tank. In how many hours can the leak alone drain all the water of the tank when it is full?

To do a certain work, A and B work on alternate days with B beginning the work on the first day. A alone can complete the same work in 24 days. If the work gets completed in \(11 {1 \over 3}\) days, then B alone can complete 7/9 part of the work in ?

A reduction of 10% in the price of wheat enables a man to buy 50 grams of wheat more for a rupee. How much wheat could originally, he had for a rupee?