Answer:
If you call her to study for class in the evening, she does not answer the phone 60% of the time, she answers and says no 20% of the time, and she answers and says yes 20% of the time.
You create a simulation model for the number of nights in a week the two of you get together to study for class, and run the simulation for 20 trials.
So, a report on your results could include the average number of nights you guys studied together each week or per week.