Question : A 40-litre mixture of milk and water contains milk and water in the ratio of 7 : 3. How many litres of water should be added to the mixture so that the resulting mixture has 60% water in it?

Question : If two qualities of a fruit costing INR 20 per kg and INR 38 per kg are mixed in the ratio of 5 : 4, then find the cost of the mixture per kg (in INR).

Question : A milk merchant buys 30 litres of milk at the rate of Rs. 50 per litre and mixes 20 litres of water in it (water is free of cost). If he sells this mixture at the rate of Rs. 48 per litre, then what is the profit percentage?

Question : The liquids, X and Y are mixed in the ratio of 3 : 2 and the mixture is sold at Rs. 11/litre at a profit of 10%. If the liquid X costs Rs. 2 more per litre than Y, the cost of X /litre is (in Rs.):

Question : Milk and water in two vessels A and B are in the ratio 5 : 3 and 2 : 3, respectively. In what ratio should the liquids in both vessels be mixed to obtain a new mixture in vessel C containing half milk and half water?