A vessel of capacity 80 litres is filled with milk and water. 70% of total volume of milk and 30% of total volume of water is taken out of the vessel. It is found that the vessel is vacated by 55% . What was the initial quantity of water in the vessel?
A tank having a capacity of 4096 m3 is used by 4 families. If each family uses 4 buckets of water every day and the volume of the bucket is 16 m3 , then the water in the tank will last for ___ days.