A water drum is filled to 1//4 of its capacity. If another 30 gallons of water were added, the d...

An industrial solvent of 90% strength is prepared and stored Q in a 150 litres capacity container. The container is filled to 80% of its capacity. It is required to decrease the concentration of the solvent in the container to less than 60°%. For doing this, eithe pure water can be added to it and/or solution can be removed. But removal can only be done if there is no place for adding water. At a given time, only 10 litres of the solution can be added or removed. How many times should water be added to the solution?

In a mixture of 25 litres, the ratio of milk to water is 4:1 Another 3 litres of water is added to the mixture . The ratio of milk to water in the new mixture is

1/5 part of a drum is filled with milk. What is the capacity of drum if it require 28 L more to fall the drum completely?

The water for a factory is stored in a hemispherical tank whose internal diameter is 14 m. The tank contains 50 kL of water. Water is pumped into the tank to fill to its capacity. Calculate the volume of water pumped into the tank.

Two pipes can fill a cistern in 28 and 21 hours respectively and an another pipe can empty 30 gallons of water per hour. All the three pipes working together can fill the empty cistern in 84 hours. What is the capacity (in gallons) of the cistern?

200 gm water is filled in a calorimetry of negligible heat capacity. It is heated till its temperature is increase by 20^(@)C . Find the heat supplied to the water.