How much water must be added to 28 L milk, costing Rs. 12 per litre, so that the value of the mixture will be Rs. 10.50 per litre?
Correct Answer : D
A lump of two metals weighing 18 g is worth Rs. 87. If their weights be interchanged, it would be worth Rs. 78.60. If the price of one metal is Rs. 6.70 per gram, find the weight of the other metal in the mixture.
Several litres of acid were drawn off from a 54 L vessel full of acid and an equal amount of water is added. Again the same volume of the mixture was drawn off and replaced by water. As a result, the vessel contained 24 L of pure acid. How much acid was drawn off initially?
Father’s age is four times the age of his elder son and five times that of his younger son.When the elder son has lived to three times his present age, then father’s age will exceed twice that of his younger son’s by 3 years. What is the father’s age?