Judy has 100 math problems to solve. She decided to work on Monday, and on each day after that, to work twice as many as she did the day before. Judy kept to this plan and, after working problems on Friday, she still had seven problems left to complete. How many problems did she work each day?

Suppose that Judy completes exercises on Monday. Since she doubles the amount of exercises every day, she will complete exercises on Tuesday, exercises on Wednesday, exercises on Thrursday and exercises on Friday.

So, she completed exercises.

She still has 7 problems left, which means that she did problems so far.

So, we have

Here's the number of exercises per day: