A bottle contains spirit and water in the ratio 1 : 4 and another identical bottle contains spirit and water in the ratio 4 : 1. In what ratio should the mixtures in the two bottles be mixed to get a new mixture in which the ratio of spirit to water is 1 : 3?

In a mixture of 70 kg, the ratio of sand and cement is 4 : 1. How much sand should be added to the mixture so that the ratio of said and cement in it becomes 6 : 1?

A 20 liter mixture contains 30% alcohol and 70% water. If 5 liters of water is added to the mixture, what will be the percentage of alcohol in the new mixture?

Three equal jugs contain milk and water in ratios 1:2, 2:3 and 3:4 respectively. If mixed together, the ratio of milk to water is

A 60 liter mixture of milk and water contains 10% water. How much water must be added to make water 20% in the mixture?

Two glasses of equal volume are filled with a mixture of alcohol and water in the ratio 3 : 2 and 4 : 1, respectively. These glasses are emptied into a third glass. What is the ratio of alcohol and w…