Q. 2) Old hens can be bought at Rs. 2 each and young ones at Rs. 5 each. The old hens lay 3 eggs per week and the young ones lays 5 eggs per week, each egg being worth 30 paise. A hen (old or young) costs Rs. 1 per week to feed. I have only Rs. 80 to spend for hens, how many of each kind should I buy to give profit of more than Rs. 6 per week, assuming that I cannot house more than 20 hens.