Answer:
2.25 or 2 1/4 hours
Explanation:
To answer this, we simply have to divide the number of hours spent studying by the number of days before the test. And since 6 3/4 is in fraction form, we will convert to decimal because it makes it easier to multiply that way:
6.75 ÷ 3 = 2.25
So, Andrea studied for 2.25 or 2 1/4 hours each day before her test
Hope this helps :)