Marco owed his father $220 and began paying him back $20 at the end of each week, beginning November 1. Joni owed her father $120 and began paying back at the end of each week, beginning on the same day. What Marco owed his father in dollars at the end of n weeks can be represented by f (n) = 220 - 20 n. What Joni owed her father in dollars at the end of n weeks can be represented by g (n) = 120 - 10 n. Find the value of n for which f (n) = g (n). What does that value mean in this situation? After weeks, Joni and Marco each owed their fathers the same amount.​