Marco owed his father $210 and began paying him back $25 at the end of each week, beginning November 1. Joni owed her father $150 and began paying him back $20 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)=210-25n. What Joni owed her father in dollars by the end of n weeks can be represented by g(n)=150-20n. Find the value of n for which f(n) = g(n). What does this value mean in this situation?
After ____ weeks, Joni and Marco owed their fathers the same amount.