A mixture contains milk and water in the ratio 3 : 2. If 4 litres of water is added to the mixture, the ratio of milk and water becomes 1 : 1. What was the original quantity of milk?
In a partnership, A, B, and C invest capitals in the ratio 3 : 4 : 5. If their time of investment is in the ratio 2 : 3 : 1, find the ratio of their profits.
In a classroom, the ratio of passed to failed students is 5 : 2. If 30 more students passed, the ratio would have been 8 : 2. How many students failed?
The ratio of land to water for the whole earth is 1 : 2 and in the Northern Hemisphere, it is 2 : 3. What is the ratio of land to water in the Southern Hemisphere?