Answer :

For every pound lost during exercise, a student should drink between 12 and 18 ounces of fluid.

This means:

1. Minimum fluid intake: For every pound of weight lost, a student needs to drink at least 12 ounces of fluid. This ensures that the body stays hydrated even at the minimum recommended level.

2. Maximum fluid intake: To fully ensure proper hydration, a student may drink up to 18 ounces of fluid for each pound of weight lost. This upper limit caters to those who might require more fluid to maintain their hydration levels due to factors like intensity of exercise, temperature, and individual hydration needs.

Therefore, to stay adequately hydrated after losing a pound during exercise, a student should drink between 12 and 18 ounces of fluid.