Ella, this is the solution:
Amount of nylon rope before starting to tie off boats = 80 feet
Amount of nylon rope Melinda uses per boat = 5.5 feet
Amount of nylon rope Melinda has after securing all boats = 3 feet
Amount of boats Melinda tie off = x
In consequence:
5.5x + 3 = 80
Subtracting 3 at both sides:
5.5x + 3 - 3 = 80 - 3
5.5x = 77
Dividing by 5.5 at both sides:
5.5x/5.5 = 77/5.5
x = 14
Therefore, the correct answer is:
A. At most 16
Note: C. Less than 14 is incorrect ,because 14 is not a value lower than 14.