15. After 20 minutes at work, Ellen was able to finish 3 tasks. If she works an 8 hour day, how many tasks should she expect to finish?

72

Step-by-step explanation:

An hour is 60 minutes.

Multiply the amount of tasks to the amount of times 20 goes into 60 (60/20).

3×3= 9

Once you have the amount of tasks finished in an hour (9 tasks), you will multiply 8 hours by 9 tasks.

8×9= 72