Think that I borrowed $1000 from a person and $500 from another person. While i was going home a lost $1000. So the balance $500. From the $500 and spend $300 on fish. So the balance is $200. I split the money into 2 parts ( 100 and 100 ) and gave one part to the person who gave me $1000 and one part to the person who gave me $500. So the total money I have to give back = 1000-100+500-100=900+400=1300. So 1500-1300=200. So the question is 300( which i used for fish)-200( the balance) = 100. From where did I get the $100 ?