Jenna works in an ice cream shop. When she starts her shift the tub of chocolate ice cream is 2//3
full. When she finishes her shift 61/2
h later, there is only 1/6
of the tub left. What was the average hourly change in tub fullness?
To find the average hourly change in tub fullness, we need to calculate the difference in the fullness of the tub at the beginning and end of the shift and divide it by the number of hours.
The difference in the fullness of the tub is 2/3 - 1/6 = 4/6 - 1/6 = 3/6 = 1/2.
The shift lasted for 6 1/2 hours.
So, the average hourly change in tub fullness is (1/2) / (6 1/2) = (1/2) / 13/2 = (1/2) * (2/13) = 1/13.
Therefore, the average hourly change in tub fullness is 1/13.