mixtures

A man mixes 5 litres of orange juice at Rs. 55 per litre,12 litres at Rs. 60 per litre and 13litres at Rs. 65 per litre. At what price per litre must he sell mixture so as to gain Rs. 260 on the whole? 

 

mixtures

Several litres of milk were drawn off a 54 litre vessel full of milk and an equal volume of water added. Again the same volume of mixture was drawn off. As a result the mixture in the vessel contains 24 litres of pure milk. How much milk was drawn off initially?