Answer :
Final answer:
Jill must study for 19 hours in the third week to achieve an average of 15 hours of study time per week, after having studied for 13 hours in each of the first two weeks.
Explanation:
The main answer to the student's question on how many hours Jill needs to study in the third week to have an average of 15 hours per week is a matter of simple arithmetic. Firstly, we need to calculate the total number of hours she needs to have after three weeks to achieve this average, by multiplying the average desired (15 hours) by the number of weeks (3). This gives us 45 hours in total. Jill has already studied for 26 hours over the first two weeks (13 hours each week), so we subtract this from the total required hours to find the remaining hours Jill must study in the third week. Doing this calculation: 45 hours - 26 hours gives us 19 hours.
The explanation involves understanding the concept of averages and the ability to perform basic subtraction to determine the remaining amount of study time that is needed. To achieve an average of 15 hours over three weeks, Jill must make up the difference between what she has already studied and the total amount needed.
