From the information given, the cup holds 3 1/2 cups of water. We would convert 3 1/2 to improper fraction by multiplying 3 by 2 and adding the result to 1. This result would be the numerator of the improper fraction while the denominator would be 2. Thus, we have
3 1/2 = 7/2
Let 7/2 cups be x fluid ounces
Recall,
1 US cup = 8 fluid ounces
7/2 cups = x fluid ounces
By crossmultiplying, we have
x = 8 * 7/2
x = 28
Thus, the answer is 28 fluid ounces