Answer: The required number of fluid ounces in the sip is 1.69 ounces.
Step-by-step explanation: Given that a bottle contains 16.9 fluid ounces of water. After you take a sip, the bottle is
full.
We are to find the number of ounces of fluid that is the sip.
Since the bottle was
full after the sip, so the number of ounces of fluid left after the sip is

Therefore, the number of fluid ounces in the sip is

Thus, the required number of fluid ounces in the sip is 1.69 ounces.