Answer:
A little over 4 months.
Explanation:
First, we subtract the first payment she made from the total.
250 - 35 = 215
Now we have $215 left to pay off. She pays $25 off twice a month, so that's $50 a month.
215 รท 50 = 4 months, with a remainder of $15 to pay off.
Andrea will have paid it off 5 months later, or 4.5 months since she's paying twice a month, however, assuming this is an answer requiring work and is not multiple choice, my final answer would be a little over 4 months.