1. 3 friends live happily in a home. They have a shared servant. One day they all gone to a shop and buy a Radio pricing 50 buks and returned happily. The next day their servant goes to market, meets the shop-keeper. The shop-keepers knows that he is the servant of those 3 guys. he gives him 10 Buks and says that actually by mistake he has taken 50 for a radio pricing 40. So please return the money among your masters. The servant reaches home and says his masters that because 10 bucks cann't be devided equally so he gives 2 bucks to each of them (2*3 =6) and takes 4 bucks after asking them. Now the question is they have invested 20-2 = 18 each..so total they invested is 18 * 3 = 54 And 4 bucks is taken by servant so it makes 54 + 4 = 58. Where is the (60-58) 2 bucks?