Question 1122557
he owes 445-65x, where x is the number of weeks.
This is "at least," so he may pay back more, which means the debt may be less.
so debt is y<= 445-65x 

After three weeks, he has paid off $195, leaving $250.  He could have paid off more, so $225 is possible.
After four weeks, he has a debt no more than $185, he can't be $200 in debt.  ANSWER
After five weeks, he has a debt no more than $120, so $115 is possible.