Mac needs 30 dollars for a concert ticket. Ben says he’ll lend him 40 dollars. On payday Mac gives Ben 50 dollars. Does Mac still owe Ben money?

Question

does Mac still owe Ben 10 dollars?

Answer 1

Mac receives $40 from Ben (if Ben fulfils his promise) and later gives Ben $50, so Mac has lost $10, and Ben has gained $10. Mac does not owe Ben any money, but Ben owes Mac $10. The concert ticket is not part of the transaction between Mac and Ben.