An alloy is made by mixing metal A costing and metal B costing in the ratio . What is the cost (in Rs.) of of this alloy?
In what ratio should coffee powder costing be mixed with coffee powder costing so that the cost of the mixture is ?
A drum contains of ethanol. of this liquid is removed and replaced with water. of this mixture is again removed and replaced with water. How much water (in litres) is present in this drum now ?