A milkman uses three containers forselling milk, their capacities being 40 L, 30 L and 20 respectively. He fills respectively 87.5%, 80% and 90% of the containers with a mix of milk and water in the ratios, 3: 2, 5: 1 and 7:2 respectively. What is the ratio of the total quantity of milk to that of water carried by him?
The average age of fifteen persons is 32 years. If two more persons are added, then the average is increased by 3 years. The new persons have age difference of 7 years. The age (in years) of the younger among the new persons is: