Macky drank 6 bottles of water over 8 tennis practices. How much water did Macky drink each practice if she drank the same amount each time?

All that's required here is to divide 8 by 6 (1.333333), to figure out the exact number of water each time, or if you wanted to use estimates and averages, if the average water bottle contains 16 fluid ounces, then that equivalates to 96 fluid ounces, over 8 practices would be 12 ounces per practice or 3/4 of a bottle.