Answer:
more than 20 dollars
Step-by-step explanation:
It doesn't matter how much money was in the account before; it matters that the account was overdrawn, which means whatever amount of money was taken out made the balance go negative. Then, the problem says that after the deposit was made, the account had a balance of 20 dollars, which means the person must have put in at least 20 dollars to make the account go from negative to zero, and then to 20.
